Hepatitis B virus infection

At a Glance

Hepatitis B virus infection is viral hepatitis caused by HBV infecting the liver, which can follow an acute or chronic course.

When symptoms appear, representative ones include fatigue, fever, loss of appetite, nausea/vomiting, abdominal pain, joint pain, dark urine, pale stools, and jaundice.

How the disease works

The main cause is the hepatitis B virus, and it can be transmitted through contact with bodily fluids of infected individuals, such as blood and semen.

Viral infection causes inflammation and tissue damage in the liver, which may result in decreased liver function.

Variations in presentation among individuals

Newborns, intravenous drug users or those who share needles, sexual partners/cohabitants of infected individuals, healthcare workers with blood exposure, hemodialysis patients, and residents or travelers to endemic areas may be at high risk.

The broad framework of diagnosis and management

Acute infection may resolve without symptoms, but chronic infection can remain asymptomatic for years or decades and may progress to cirrhosis, liver cancer, or liver failure, or undergo reactivation.

Diagnosis is made by comprehensively evaluating exposure history, symptom confirmation, physical examination, and blood tests including Hepatitis B testing.

Current status of treatment

Since the absence of symptoms does not rule out infection or liver damage, screening and clinical interpretation of test results are important if there is a risk or possibility of past exposure.

Management includes preventing infection and blocking transmission, confirming infection status, assessing liver damage, and, if necessary, antiviral treatment and long-term follow-up.

Acute Hepatitis B usually resolves without specific antiviral treatment, but in chronic infection, antiviral agents may be necessary if blood tests suggest liver damage.

How to read clinical trials

Since complications of chronic infection may manifest late, follow-up is important, and treatment outcomes cannot be determined solely by registration in observational studies on ClinicalTrials.gov.

Points to verify during clinical consultations

In clinical practice, it is helpful to review past examinations and vaccinations, exposure via blood or sexual contact, exposure to family members or cohabitants, symptoms and pregnancy status, liver damage assessment, and follow-up plans.