Hepatitis B

Overview

Hepatitis B is a viral infection that affects the liver. The liver is an important organ that helps process nutrients, filter harmful substances from the blood, support digestion, and produce proteins needed for many body functions. When hepatitis B infects the liver, it can cause inflammation and, in some people, long-term liver damage.

Hepatitis B can be short-term or long-term. A short-term infection may clear from the body on its own. A long-term infection, also called chronic hepatitis B, can remain in the body for years and may require regular monitoring and specialist care. Some people feel very unwell during infection, while others have no symptoms and may not know they carry the virus.

Hepatitis B is not spread through casual contact such as hugging, sharing food, coughing, or using the same toilet. Understanding how it spreads and how it is managed can help patients protect their health and reduce the risk of transmission to others.

Symptoms

Many people with hepatitis B do not have symptoms, especially in the early stages. When symptoms occur, they may appear gradually and can be similar to other illnesses. Possible symptoms include:

• Tiredness or weakness
• Loss of appetite
• Nausea or vomiting
• Abdominal discomfort, especially on the right side under the ribs
• Dark urine
• Pale or clay-colored stools
• Yellowing of the skin or eyes, known as jaundice
• Joint or muscle aches
• Fever

In chronic hepatitis B, symptoms may be absent for a long time even if the virus is active. For this reason, blood tests and liver monitoring are important for people who may have been exposed or who have known hepatitis B infection.

Causes and Risk Factors

Hepatitis B is caused by the hepatitis B virus. It spreads through contact with infected blood or certain body fluids. Common routes of transmission include:

• Birth from a mother with hepatitis B to her baby
• Unprotected sexual contact with an infected person
• Sharing needles or equipment that may contain blood
• Use of non-sterile instruments for tattoos, piercings, or medical procedures
• Sharing personal items that may have traces of blood, such as razors or toothbrushes
• Occupational exposure to blood, especially in healthcare settings

Risk may be higher for people who live with someone who has hepatitis B, have multiple sexual partners, travel to or come from regions where hepatitis B is more common, receive dialysis, or have certain medical conditions that affect the immune system.

Vaccination is an important way to help prevent hepatitis B. People who are unsure about their vaccination status or exposure risk can discuss testing and prevention with a healthcare professional.

Diagnosis

Hepatitis B is diagnosed with blood tests. These tests can show whether a person has a current infection, had a past infection, is immune due to vaccination, or may need further evaluation. Blood tests may also assess how active the virus is and how the liver is functioning.

If hepatitis B is confirmed, additional tests may be recommended to evaluate liver health. These can include liver enzyme tests, imaging studies such as ultrasound, or non-invasive tests that estimate liver stiffness. In selected cases, a liver tissue sample may be considered, but this is not needed for every patient.

Diagnosis and follow-up are usually managed by a gastroenterologist, hepatologist, infectious disease specialist, or another trained healthcare professional. Regular monitoring helps identify changes early and guide care decisions.

Treatment Options

Treatment depends on whether hepatitis B is short-term or chronic, the level of virus activity, liver test results, age, overall health, and whether there are signs of liver damage. Not everyone with hepatitis B needs immediate medical treatment, but regular follow-up is important.

For short-term hepatitis B, care is usually supportive and focuses on monitoring, rest, nutrition, and preventing spread to others. Healthcare professionals may advise avoiding substances that can place extra stress on the liver.

For chronic hepatitis B, treatment may include antiviral therapy to help control the virus and reduce liver inflammation. The decision to start treatment is based on medical assessment and test results. Some people are monitored without medication if the virus is inactive and the liver is healthy. Others may need long-term treatment and regular testing.

People with chronic hepatitis B may also need screening for liver complications. If advanced liver disease develops, care may involve a multidisciplinary team. In severe cases, liver transplantation may be discussed as an option, depending on the individual situation.

Patients with hepatitis B should inform healthcare providers before starting new medications or supplements, as some products can affect the liver. Family members and close contacts may also benefit from testing and vaccination guidance.

When to See a Doctor

Seek medical advice if you think you may have been exposed to hepatitis B, have symptoms of liver inflammation, or have a household or sexual contact with hepatitis B. Testing is also important for pregnant women, people with past exposure risks, and those from areas where hepatitis B is more common.

Urgent medical care is needed if symptoms are severe, such as marked yellowing of the eyes or skin, confusion, severe abdominal pain, persistent vomiting, unusual bleeding, or extreme weakness.

If you have already been diagnosed with hepatitis B, keep regular follow-up appointments even if you feel well. Ongoing monitoring can help your medical team assess liver health, discuss prevention for close contacts, and choose the most appropriate care plan for your situation.