What is Hepatitis D? Symptoms, Transmission, and Treatment

The clearest answer to the question of what Hepatitis D is, is that it is a viral infection causing severe liver inflammation, which requires the Hepatitis B virus to exist. Also known as Delta hepatitis, this disease cannot multiply or cause infection in the human body on its own. Below, you will find everything you need to know about this virus, which deeply affects liver health, including its symptoms, transmission routes, and treatment options.

• Hepatitis D is a defective virus that needs the Hepatitis B virus (HBV) to multiply.
• The disease is primarily transmitted through contact with blood and infected body fluids.
• Getting vaccinated against Hepatitis B is the most effective known way to prevent Hepatitis D.
• When it becomes chronic, it significantly increases the risk of cirrhosis and liver cancer.
• Specific antibody and viral genetics (RNA) blood tests are used in the diagnostic process.

What is Hepatitis D and How is it Related to Hepatitis B?

The Hepatitis D virus (HDV) is defined in the medical world as a "defective" virus. It does not have the ability to enter a cell and multiply on its own. To survive and attack liver cells, it needs the outer envelope proteins of the Hepatitis B virus (HBV). Because of this, the relationship between Hepatitis D and Hepatitis B is incredibly tight; for a person to develop Hepatitis D, they must already be carrying the Hepatitis B virus.

Medically, this partnership occurs in two different ways. The first, co-infection, happens when a healthy person contracts both Hepatitis B and Hepatitis D viruses at the exact same time. This usually begins as a severe acute infection, but in most patients, the immune system successfully clears both viruses from the body. The likelihood of it becoming chronic is relatively low.

The second, and much more dangerous scenario, is superinfection. This means a person who already has chronic Hepatitis B later encounters the Hepatitis D virus. In a superinfection, the virus multiplies very rapidly, the immune system's chance of clearing it is quite low, and the disease largely becomes chronic. Liver damage progresses much faster and more destructively compared to those carrying only Hepatitis B.

Causes and Risk Factors of Hepatitis D

The primary cause of the disease is infection with the Hepatitis Delta Virus (HDV). Transmission occurs when the virus enters a healthy person's bloodstream through the blood or body fluids of an infected individual. The risk groups for Hepatitis D are essentially identical to those at risk for Hepatitis B. Anyone at risk for blood-borne diseases is also a potential target for this virus.

At the forefront of risk groups are intravenous drug users and people who use unsterilized needles. Hemodialysis patients, individuals requiring frequent blood transfusions, and patients using clotting factors are also at high risk. Similarly, people sharing a household with someone who has a chronic Hepatitis B infection, or their sexual partners, must be careful.

Healthcare professionals, laboratory staff, and care home personnel who frequently encounter blood and body fluids occupationally are also in the risk pool. Although there is a risk of transmission from infected mothers to their babies, this rate is lower compared to the mother-to-child transmission rate of Hepatitis B. Unsterilized environments for tattoos, piercings, or acupuncture can also pave the way for the virus to spread.

What Are the Symptoms of Delta Hepatitis?

Delta hepatitis symptoms vary depending on whether the disease is acute (sudden onset) or chronic (long-term). During the acute infection phase, patients typically experience a severe flu-like illness. Extreme fatigue, exhaustion, loss of appetite, and unexplained weight loss are the first noticeable signs. These are frequently accompanied by muscle and joint pain, a mild fever, and nausea.

As the disease progresses, liver functions begin to deteriorate, and more specific symptoms emerge. Jaundice (yellowing of the skin and the whites of the eyes), urine turning the color of dark tea, and pale, clay-colored stools are the most typical findings. A feeling of tenderness and fullness in the upper right abdomen, where the liver is located, is also commonly described.

In chronic Hepatitis D cases, however, symptoms can remain silent for years. Patients might only feel mild fatigue. But when liver damage progresses to the cirrhosis stage, much more serious and life-threatening symptoms appear, such as fluid accumulation in the abdomen (ascites), swelling in the legs (edema), easy bruising on the skin, and a tendency to bleed.

Hepatitis D Transmission Routes and Diagnostic Methods

Hepatitis D transmission routes are primarily based on contact with blood and blood products. The percutaneous route—meaning a needle stick through the skin or a sharp instrument injury—is the most common form of transmission. Shared syringes, unsterilized medical instruments, or personal hygiene items (like razors and toothbrushes) act as carriers for the virus. Unprotected sexual intercourse is another significant transmission route. Given the nature of blood-borne and sexually transmitted diseases, the preventive measures we discussed in our article What is AIDS and How is it Transmitted? also apply to this virus.

The diagnostic process at the hospital begins with listening to the patient's complaints and a detailed physical examination. The physician checks for any enlargement or tenderness in the liver. Blood tests are essential for a definitive diagnosis. High levels of liver enzymes (ALT and AST) in the blood indicate liver damage.

For a specific Hepatitis D diagnosis, antibodies formed against the virus (Anti-HDV) are looked for in the blood. If the antibody test is positive, a genetic test called HDV RNA is performed to understand whether the virus is actively multiplying. To evaluate the extent of liver damage and the development of cirrhosis or fibrosis (scar tissue), ultrasonography, a fibroscan, or, if necessary, a liver biopsy may be performed.

How is Hepatitis D Treated?

Hepatitis D treatment is a process the medical world is still working on intensively, and it remains challenging to manage with current medical approaches. There is no specific medication for the acute infection phase. Patients are advised to get plenty of rest, drink adequate fluids, and maintain a healthy diet. It is absolutely crucial to stay away from any toxic substances that would strain the liver, especially alcohol and medications not approved by a doctor.

In chronic Hepatitis D treatment, the goal is to stop the virus from multiplying and slow the progression of liver damage. At this stage, injectable treatments called pegylated interferon alfa are generally used. This treatment can last for months, and the patient's response is closely monitored with regular blood tests. Side effects such as fatigue, mild fever, or mood changes may occur during the treatment period.

If the disease turns into fulminant hepatitis (sudden and severe liver failure) or if advanced cirrhosis has developed, medical treatments fall short. In such life-threatening situations, the only and most effective treatment option is a liver transplant surgery. Successful results are achieved in the majority of patients after a transplant, and the risk of the virus recurring in the new liver is kept under control with special medications.

Possible Complications: Cirrhosis and Liver Cancer

The most feared aspect of Hepatitis D is that it causes much faster and more aggressive destruction in the liver compared to a standalone Hepatitis B infection. In the vast majority of patients who develop a superinfection, the disease becomes chronic, and liver cells remain under a constant bombardment of inflammation. Over time, this chronic inflammation causes healthy liver tissue to be replaced by hard, non-functional scar tissue (fibrosis).

When scar tissue envelops the entire liver, the condition is called cirrhosis. In Hepatitis D patients, the development of cirrhosis occurs at much earlier ages and in a shorter time compared to other types of hepatitis. A liver that has reached the cirrhosis stage cannot perform its vital duties, such as clearing toxins from the body, clotting blood, and processing nutrients.

In the next stage of cirrhosis, the risk of hepatocellular carcinoma, or liver cancer, comes into play. Genetic mutations can occur in damaged liver cells that are constantly trying to regenerate. Therefore, it is of vital importance for chronic Hepatitis D patients to undergo cancer screening with ultrasound and blood tests at regular intervals.

When Should You See a Doctor?

Liver diseases often progress insidiously, so you need to pay attention to your body's early warning signals. If you notice extreme fatigue lasting more than a few days, loss of appetite, pain in the upper right part of your stomach, or a noticeable darkening in the color of your urine, you should consult a healthcare facility without delay.

Some symptoms are signs of severe liver failure or internal bleeding that require emergency medical intervention. If you experience or observe the following situations in a loved one, you should immediately call the 112 Emergency Call Center or go to the nearest hospital emergency room:

• Sudden and severe yellowing of the whites of the eyes and skin,
• Rapid and painful swelling in the abdomen (fluid accumulation),
• Vomiting blood that looks like coffee grounds, or passing tar-colored, black stools,
• Mental confusion, a tendency to sleep, slurred speech, or personality changes (symptoms of hepatic encephalopathy).

Diagnosis and Treatment Process at BHT CLINIC İstanbul Tema Hastanesi

The management of liver diseases is a complex process that requires different medical specialties to work together. At BHT CLINIC İstanbul Tema Hastanesi, we adopt a multidisciplinary approach for our patients suspected of having Hepatitis D or who have chronic liver disease. Our Gastroenterology and Infectious Diseases departments use the most up-to-date laboratory and imaging technologies to make a rapid and accurate diagnosis.

Deterioration in liver functions also directly affects the body's general metabolism, blood sugar balance, and hormone regulation. For the management of such metabolic complications, our Endocrinology and Metabolism unit also actively supports the treatment process. Our fully equipped emergency department, providing 24/7 service at our hospital, has the capacity to intervene immediately in situations like sudden liver failure or bleeding.

To avoid postponing your health and to have your liver functions checked in detail, you can immediately choose the most suitable date and time on our BHT CLINIC appointment page and consult with our specialist physicians.

Frequently Asked Questions

Is there a Hepatitis D vaccine?

There is no specific vaccine developed against the Hepatitis D virus. However, since Hepatitis D can only exist alongside the Hepatitis B virus, getting the Hepatitis B vaccine indirectly provides you with 100% protection against Hepatitis D as well.

Do only Hepatitis B patients get Hepatitis D?

Yes, because the Hepatitis D virus has a defective structure, it needs the protein envelope of the Hepatitis B virus to enter a cell and multiply. Therefore, it is medically impossible for a person who does not have the Hepatitis B virus in their body to contract Hepatitis D.

Does Hepatitis D heal completely?

In acute infections, some patients can completely clear the virus from their bodies through the strength of their immune system. However, it is difficult to completely eradicate chronic Hepatitis D from the body; the treatments applied aim more at suppressing the multiplication of the virus and halting liver damage.

Is Hepatitis D transmitted from mother to baby?

Yes, there is a risk of transmission from an infected mother to her baby during childbirth. However, this transmission rate is quite low compared to the risk of mother-to-child transmission of Hepatitis B or Hepatitis C. The Hepatitis B vaccine and serum administered to the baby after birth further reduce this risk.

Is Hepatitis D transmitted through touch or hugging?

No, the Hepatitis D virus is transmitted through blood and infected body fluids. The virus is not transmitted through daily social contact such as being in the same environment, hugging, shaking hands, breathing the same air, or eating from the same plate.

This article is for informational purposes only; please be sure to consult your physician for diagnosis and treatment.