Hepatitis D: Symptoms, Testing, Treatment and Prevention

Hepatitis D is a liver infection caused by the hepatitis D virus, also called HDV or the delta virus. It occurs in people who also have hepatitis B. The combination can cause more serious liver disease than hepatitis B alone, but a diagnosis does not tell you how much damage has already occurred. The useful next steps are confirming active infection, assessing the liver and discussing treatment with an experienced clinician. [1]

This guide explains the tests, treatment decisions and everyday precautions that matter after a possible exposure or diagnosis. Keep a copy of your results and use the questions near the end to prepare for your appointment. Treatment information was checked on 12 October 2026; approval and access depend on the country.

Medical information only: this article cannot diagnose an infection or choose treatment for an individual. A liver specialist should interpret test results and prescribe or change medicines.

What makes hepatitis D different?

The word hepatitis means inflammation of the liver. It describes a type of injury rather than one single disease: viruses, alcohol and some medicines can all cause it. Therefore, an abnormal liver blood test does not identify the cause on its own. Hepatitis D is specifically an infection, not a name for every severe liver problem. Having viral hepatitis also does not mean that alcohol caused the illness. [31]

Coinfection and superinfection

Coinfection means acquiring hepatitis B and hepatitis D together. This can produce a serious short-term illness, although it usually does not become a lifelong double infection. Superinfection means acquiring HDV when hepatitis B is already present. Superinfection is more likely to persist and can accelerate liver damage. These terms describe the timing of two infections; they do not rank a person’s behavior or imply that anyone is to blame. A clinician uses the history and blood results to understand the pattern rather than asking you to identify the exact day infection happened. [2]

It helps to keep three questions separate during an appointment: Is a virus present now? Has the liver developed scarring? Is the liver still doing its essential work adequately? A person can need treatment even when daily life feels normal, and a positive test does not automatically mean liver failure. Ask the clinician to explain which of these questions each test answers. Write down unfamiliar terms so the discussion ends with a clear plan rather than a list of unexplained abbreviations. [9]

Symptoms can be noticeable or silent

Acute hepatitis D may cause fatigue, fever, poor appetite, nausea, vomiting, joint pain or discomfort in the abdomen. Dark urine, pale stools and yellow eyes or skin can also occur. These symptoms overlap with other infections and liver conditions, so they cannot confirm HDV. In chronic infection, there may be few symptoms until significant damage has developed. Feeling well therefore does not replace testing or follow-up. Conversely, tiredness alone does not prove that HDV is active or getting worse; it needs to be considered with the rest of the assessment. [3]

As liver disease advances, changes can include itching, unintentional weight loss, reduced muscle strength, easy bruising, swelling or difficulty thinking. Several liver conditions can coexist, so an assessment may also consider alcohol exposure, metabolic problems, medicines and other causes of injury. Tell your team about a sustained change in appetite, strength, weight or sleep rather than assuming every new problem is an unavoidable part of hepatitis. Keeping brief notes about when symptoms started and how they affect meals, work or walking can make the discussion more useful. [30]

How HDV spreads, and how it does not

HDV spreads through exposure to infected blood or certain body fluids. Relevant situations include shared needles or injection equipment, unprotected sex, accidental needlestick injuries and sharing personal items that may carry blood. Mother-to-child transmission can occur but is uncommon. The prerequisite for HDV infection is hepatitis B, whether acquired at the same time or already present. [2]

Hepatitis D is not spread by hugging, sharing a meal, sitting beside someone, coughing or sneezing. Ordinary companionship does not need to stop. People with hepatitis D deserve the same kindness and privacy as anyone else living with an infection. [3]

Make prevention practical at home: keep toothbrushes and razors separate, avoid sharing equipment that can be contaminated with blood, and arrange hepatitis B testing and vaccination for susceptible household members and sexual partners. Do not assume that someone has protection simply because they remember receiving an injection years ago; a clinician can review their records and decide whether testing is needed. Blood can be present in amounts too small to see. The goal is to prevent blood and sexual exposures while preserving ordinary family life, not to separate someone’s plates, furniture or food. Discuss suitable sexual precautions with the clinical team while a partner’s hepatitis B status and protection are being clarified. [20]

Which blood tests confirm hepatitis D?

Start with the hepatitis B picture

Hepatitis B and hepatitis D tests answer different questions. A hepatitis B screening panel commonly includes HBsAg, anti-HBs and total anti-HBc. HBsAg is a surface protein of hepatitis B and usually indicates current infection. Anti-HBs helps assess immunity, while anti-HBc indicates exposure to the actual virus and is not produced by vaccination alone. The combination matters more than an isolated result. Ask for an explanation of the full panel instead of assuming that any positive antibody means active infection. These hepatitis B tests also do not substitute for an HDV test. A record saying only “hepatitis screen” may not tell you which viruses were checked. [8]

Antibody first, then HDV RNA

For people with positive HBsAg, anti-HDV antibody testing looks for evidence of past or current exposure to hepatitis D. A positive antibody result needs an HDV RNA test to determine whether viral genetic material is detectable and infection is active. Antibodies alone cannot answer that question. WHO’s preferred approach is to offer anti-HDV testing to people with hepatitis B surface antigen positivity, with priorities adapted where testing resources are limited. If your antibody test is positive, ask who will arrange the RNA test, whether the sample must go to a specialist laboratory and how you will receive the result. This closes a common gap between a screening result and a usable diagnosis. [6]

A negative result may need reconsideration after a new exposure or an unexplained change in liver tests. EASL recommends repeat testing when clinically indicated, rather than treating one old test as permanent reassurance. During confirmed infection, repeated HDV RNA and liver assessments help the team follow activity and response to treatment. Ask whether results were measured using the same laboratory method, especially if a new result seems inconsistent with earlier tests. Different assays and changing viral levels can complicate comparisons; the specialist should interpret the pattern. [7]

Reading the result without jumping to conclusions

Before leaving the testing discussion, ask the team to put your next step in plain language. For example: “Was this an antibody test or an RNA test?” “Is another sample needed?” “Who contacts me if the result is positive?” “When should I call if I have heard nothing?” If testing is unavailable locally, ask about a referral or a laboratory that accepts samples from your clinic. Keep the actual report, including the date and units, rather than a screenshot containing only the word positive. That record is useful if your care moves between hospitals or countries.

Checking how well the liver is working

A liver blood panel contains several measurements, not a single score. ALT and AST are enzymes used to look for liver cell injury. Bilirubin relates to processing and removal of a breakdown product, while albumin is a protein made by the liver. Tests of clotting, such as prothrombin time, can contribute information about liver function. An abnormal measurement is a reason for interpretation, not a diagnosis by itself. Medicines and other illnesses may influence results. Ask which values are changing and what those changes mean in your situation. A useful explanation should connect the numbers with your symptoms, examination and other tests, rather than describing the whole panel simply as good or bad. [9]

Blood tests and scans help assess scarring, sometimes called fibrosis. Elastography measures liver stiffness without surgery; ordinary ultrasound and other imaging can show the liver’s structure and signs of complications. A biopsy is sometimes considered when other information is insufficient or a different diagnosis needs clarification. It is not automatically required for everyone with hepatitis D. Before a procedure, ask what question it will answer and how the answer could change treatment. Tell the team about all medicines and supplements and follow its preparation instructions. Also ask how and when you will receive the result, because arranging a test is only one part of making it useful. [10]

Compensated and decompensated disease

Cirrhosis means substantial liver scarring that changes the organ’s structure and blood flow. Some people have cirrhosis while the liver still performs adequately; clinicians call this compensated disease. Complications such as fluid collecting in the abdomen, bleeding from enlarged veins or toxin-related confusion indicate that the situation has become more serious. These complications are often discussed as decompensation. Scarring can increase pressure in the portal vein, producing problems outside the liver itself. This explains why care may include checking the digestive tract, kidneys, nutrition and thinking as well as the liver. The distinction between compensated and decompensated disease is important when deciding which treatments are suitable. It cannot be reliably made from appearance or how energetic someone feels. [11]

Current hepatitis D treatment options

Treatment decisions belong with a clinician experienced in hepatitis D, usually a hepatologist or a specialist team. Bring your HDV RNA results, hepatitis B results, liver assessment and medicine list. Ask what the proposed treatment aims to achieve, how benefit will be measured and what would lead the team to change course. Cost, injection training, travel, laboratory access and the ability to attend appointments are worth discussing before treatment begins. These practical details can determine whether a medically sensible plan is workable for you.

Bulevirtide: approvals differ between countries

In the United States, the FDA approved Hepcludex, containing bulevirtide-gmod, on 22 May 2026 for adults with chronic HDV infection who do not have cirrhosis or who have compensated cirrhosis. Approval used the accelerated approval pathway. Older articles saying that no FDA-approved HDV treatment exists are therefore outdated. The pivotal study assessed a combination of viral and liver-enzyme improvement. Such a treatment response should not be translated into a promise of cure or a guarantee that established scarring will disappear. The approved population also matters: this is not a general authorization for every age group or every stage of liver disease. A US clinician should use the current prescribing information when considering eligibility. [12]

In the European Union, the current Hepcludex indication covers HDV-RNA-positive adults and children aged three years or older who weigh at least ten kilograms and have compensated liver disease. Bulevirtide blocks a route used by the virus to enter liver cells. Treatment is given by injection under the skin and should be started by a doctor experienced in HDV management. The EU indication is therefore different from the US adult indication. Families should not use an adult prescription, a foreign dosing schedule or a product description from another market to plan a child’s treatment. Eligibility, formulation and administration should be checked against the local authorization and the specialist’s instructions. [13]

For readers in the UAE, European or US approval does not establish UAE registration, stock, insurance coverage or a lawful access route. Confirm those details with a local liver specialist and pharmacist using the Emirates Drug Establishment’s current information. The directory check for this guide could not establish Hepcludex’s local registration status, so no claim of UAE approval or nonapproval is made here. [29]

Do not stop treatment without a plan

Hepcludex carries an important warning: stopping can trigger severe worsening of both hepatitis D and hepatitis B, particularly in people with cirrhosis. The US label calls for close clinical and laboratory monitoring for at least six months after discontinuation. Contact the prescribing team before a supply runs out or if side effects make you want to stop. Do not invent a restart schedule yourself. Possible adverse effects include injection-site reactions, headache, abdominal pain, fatigue and itching. Serious allergic reactions are also possible; breathing difficulty or swelling suggesting a severe reaction needs emergency help. Ask in advance which symptoms require immediate care, whom to call after hours and what to do about a missed treatment. This guide deliberately does not provide an individual dose or injection schedule. [14]

Where pegylated interferon fits

Pegylated interferon alfa may be considered for selected people with chronic hepatitis D. Response is limited and relapse can occur, so completing treatment does not remove the need for follow-up. It is contraindicated in decompensated cirrhosis. Suitability and any combination with other medicines require specialist judgment. [7]

Interferon can cause substantial side effects, including flu-like symptoms, tiredness, sleep problems and mood changes. Its safety assessment also considers thyroid disease, autoimmune conditions, heart problems and other medical history. Tell the team about past psychiatric illness and any new depression, agitation or marked change in behavior. These issues deserve prompt attention, not silent endurance to prove you can finish treatment. Blood monitoring and regular clinical review are part of safe use. Pegasys product information describes uses in other diseases as well as important restrictions; that does not mean it is specifically authorized for hepatitis D in every country. Ask whether the proposed HDV use is off-label locally and what evidence supports it in your circumstances. [15]

Why hepatitis B medicines still matter

Medicines used to suppress hepatitis B do not directly suppress HDV. They may still be needed to manage the accompanying HBV infection. Hepatitis B vaccination also does not treat established HBV or prevent HDV superinfection once hepatitis B is already present. These distinctions are why prevention and treatment require different plans. [1]

The decision about hepatitis B antiviral treatment considers viral activity, liver damage and other clinical factors. A low HBV result should be interpreted alongside HDV and the liver assessment, rather than used as a reason to cancel specialist care. Keep all prescribers informed about hepatitis B, particularly before cancer treatment or medicines that suppress the immune system, because management may need adjustment. Tell the team about cost or refill problems before you run out. If two medicines are prescribed, ask what each one is targeting and which blood tests monitor it. A written medicine list should include names, reasons for use, allergies and the clinician responsible for each prescription. This helps prevent confusion when several services share your care. [16]

Long-term care includes more than antivirals

If cirrhosis is present, treatment also addresses complications. A clinician may prescribe medicines for fluid retention, arrange measures to reduce the chance of bleeding from enlarged veins, or treat toxin-related changes in thinking. Some people need procedures as well as medicines. None of these measures should be copied from another patient’s plan: fluid balance, kidney function and blood pressure can alter what is safe. Ask whether vaccinations and infection prevention need updating, and check before taking nonprescription pain medicines or herbal remedies. Treating the cause of liver injury and treating its complications are complementary parts of care. Report worsening symptoms promptly even if you are already taking an antiviral and attending scheduled blood tests. [17]

Liver cancer surveillance

People with cirrhosis and some other high-risk groups with hepatitis B are offered regular liver cancer surveillance. AASLD recommends ultrasound with an alpha-fetoprotein blood test, generally every six months, for eligible people at risk. Your specialist decides whether you meet the criteria and whether another imaging method is needed. Surveillance looks for problems before symptoms appear; an abnormal screening result does not by itself diagnose cancer. Additional imaging or other assessment may be necessary. Likewise, one reassuring scan does not mean that all future scans can be cancelled. Ask who orders the next examination and keep its date in your calendar. If you move or change hospitals, transfer prior reports so the new team can compare findings and maintain the schedule. [18]

When transplant assessment is discussed

A liver transplant replaces a severely diseased liver with a donor liver and can be life-saving when the liver fails. Referral for assessment is a process, not a promise that surgery will happen immediately. The transplant team evaluates health, treatment needs and practical support, and explains the relevant donor and waiting-list arrangements. After a transplant, regular tests and medicines to prevent organ rejection are essential. Ask what support would be needed for appointments, medicines and recovery. The conversation can feel overwhelming, so taking a trusted person and requesting a written explanation can help. You can also read our guide to liver failure warning signs and specialist care for an overview of the issues to discuss. [19]

Prevention for partners, households and future exposures

Review hepatitis B vaccination

For someone susceptible to hepatitis B, vaccination is the main way to prevent acquiring HBV and thereby prevent hepatitis D. Bring any vaccination record to the appointment so the clinician can identify the appropriate next step. The number and timing of doses depend on the vaccine and individual circumstances. If a dose was missed, contact the clinic to continue the recommended schedule rather than assuming protection is complete. Most healthy people do not routinely need booster doses, but special circumstances can change advice. Vaccination records, infection testing and tests of immune response are related but different pieces of information. Ask which are relevant for you instead of purchasing repeated tests or extra doses without a clinical reason. [28]

After a needlestick or other blood exposure

Get prompt medical advice after a needlestick or significant contact with potentially infected blood, even if you feel well. Tell the clinician when it happened, what the exposure involved and what you know about your hepatitis B vaccination and antibody results. Depending on the situation, hepatitis B vaccine and hepatitis B immune globulin may be indicated; these decisions are time-sensitive. The exact plan depends on the exposed person’s protection and the source of exposure, so there is no single postexposure schedule for everyone. Occupational exposures should also be reported through the workplace’s established process. Do not wait for hepatitis symptoms before asking for help. The assessment may cover other blood-borne infections as well as hepatitis B and D. [21]

Pregnancy and newborn protection

Tell both the maternity team and liver specialist about hepatitis B and D before or early in pregnancy. Hepatitis B screening is important during each pregnancy, and HBV DNA testing helps guide additional prevention when infection is present. A baby born to someone with hepatitis B needs prompt protection: CDC guidance specifies hepatitis B vaccine and hepatitis B immune globulin within twelve hours of birth, followed by completion of the vaccine series and later testing. Make sure the delivery service has the mother’s results before birth, rather than relying on a verbal reminder during labor. Ask who will arrange the baby’s follow-up and how the plan will be communicated if delivery happens at another hospital. Maternal medicines also need individual review. [22]

Hepatitis B itself does not automatically prevent breastfeeding when the baby receives appropriate protection. If nipples or surrounding skin are cracked and bleeding, seek advice and temporarily pause breastfeeding from the affected area as directed, because blood exposure is a concern. A lactation professional can help protect milk supply and plan feeding until healing occurs. Discuss every maternal medicine separately with the liver and maternity teams: advice about viral transmission is not the same as advice about a medicine passing into milk. Do not assume that a treatment used before pregnancy remains suitable throughout pregnancy or breastfeeding. [23]

Food, medicines and daily life

Protect nutrition rather than following a cleanse

When cirrhosis is present, nutrition needs individual attention. Poor appetite and altered nutrient handling can contribute to malnutrition even when the abdomen looks swollen. A dietitian can help plan enough energy and protein, suitable meal timing and any necessary sodium restriction. Avoid prolonged fasting or eliminating major food groups without advice; smaller, more frequent meals may be more manageable. People with cirrhosis should avoid raw or undercooked seafood and meat and unpasteurized milk products because infections can be more serious. Alcohol can cause further damage and should be avoided. If finances, nausea or difficulty shopping interfere with eating, tell the team directly. A useful nutrition plan should fit available foods and daily routines rather than depend on expensive products. [24]

If you are physically dependent on alcohol or develop shaking, sweating or nausea when you cut down, seek medical help to stop safely. Suddenly stopping can be dangerous. Severe withdrawal symptoms such as hallucinations or seizures need emergency care. Asking for support is part of protecting your health. [32]

Commercial liver cleanses are not a substitute for infection treatment or follow-up. Research on detox programs is limited and often poor quality; claims that they remove toxins can go well beyond the evidence. Restrictive fasting, laxative products and excessive water or herbal tea can cause problems such as dehydration or disturbed mineral balance. A product described as natural can still contain ingredients that are harmful or undisclosed. Before spending money, ask exactly what clinical outcome the product has been shown to improve and whether the claim comes from reliable research in people. Do not let a cleanse delay a needed blood test, scan or specialist appointment. [25]

Check supplements and nonprescription products

Bring all supplements into the medicine review, including vitamins, bodybuilding products, traditional remedies, concentrated herbal extracts and products advertised for liver support. In the United States, dietary supplements do not go through the same premarket approval process for safety and effectiveness as prescription medicines. They can interact with medicines or cause harm, and more is not necessarily better. Show the pharmacist the ingredient label rather than only a brand name, because formulations can vary. Mention products bought online or used occasionally as well as those taken every day. A supplement recommended by a friend may be unsuitable for someone with a different liver stage or prescription list. Ask for a clear answer about any product you are already using before adding another. [26]

Make follow-up workable

Keep one place for appointment dates, laboratory reports, prescriptions and contact numbers. Before travel, ask the pharmacy about supply and any storage or transport instructions for your prescribed medicine. If work hours, transport, language or cost make appointments difficult, say so early. Ask whether the service offers interpretation, coordinated blood draws or another practical arrangement. A plan you cannot realistically follow needs discussion, not guilt. You can choose whom to involve for emotional and practical support while keeping medical information private. It is reasonable to ask a clinician to explain the diagnosis to a partner or trusted relative with your permission.

Research and questions for your next appointment

A clinical trial may be an option, but an investigational treatment is not guaranteed to work better than established care. Ask the study team about eligibility, possible risks, extra visits, testing, costs and what happens when the study ends. Read the consent information and discuss it with your usual specialist. Participation is voluntary; you can ask questions and withdraw, while coordinating any treatment changes safely with the team. A trial may compare treatments or use procedures that differ from routine care, so make sure you understand which parts are research and which are ordinary medical care. Be cautious about advertisements promising a guaranteed cure or pressuring you to pay quickly. A legitimate discussion should give you time to consider the information. [27]

Use these questions to leave your next appointment with a plan you understand:

• Which results confirm whether my HDV infection is active, and do I need another sample?
• What do my tests show about liver scarring and function, and what remains uncertain?
• Which treatments am I eligible for in this country, and what benefit and risks should I expect?
• What is each prescribed medicine for, and who should I contact about side effects or refill problems?
• Which blood tests and scans are due next, who arranges them, and how will I receive the results?
• What should my partner or household members arrange, and which precautions matter for us?
• Which symptoms should make me seek urgent care rather than wait for a scheduled visit?

Before leaving, repeat the next steps back in your own words and ask the clinician to correct anything you have misunderstood. Write down the next appointment and the number to call if a result or referral does not arrive. You do not need to master every technical term at once; you need a clear route from today’s information to the next decision.

Video note: the original video is retained separately for context. Its medical claims have not been independently reviewed for this update and may not reflect current treatment approvals. Use the dated written guidance and your clinical team for treatment decisions.