Hepatitis A
Hepatitis A (Hep A) is a highly contagious liver infection caused by the hepatitis A virus (HAV). The virus causes inflammation of the liver, which can affect how the liver functions.
Unlike hepatitis B and hepatitis C, hepatitis A does not usually cause a chronic (long-term) infection. Most people recover completely, although symptoms can last for several weeks and full recovery may take up to six months or longer.
In rare cases, hepatitis A can lead to severe liver damage or liver failure.
Hepatitis A at a Glance
- Hepatitis A is a contagious viral infection that affects the liver.
- It is spread primarily through contaminated food, water, or close contact with an infected person.
- Most people recover completely without long-term liver damage.
- Symptoms often resemble the flu and may include fatigue, fever, nausea, and jaundice.
- Many children and some adults have few or no symptoms.
- Vaccination is the most effective way to prevent hepatitis A.
- Good hand hygiene can help reduce the risk of infection.
What Causes Hepatitis A?
Hepatitis A is spread through the fecal-oral route, meaning the virus enters the body through contaminated food, drinks, hands, or surfaces.
Common ways the virus spreads include:
- Eating food prepared by someone who is infected and did not wash their hands properly
- Drinking contaminated water
- Close contact with an infected person
- Caring for an infected individual and handling diapers or bodily waste
- Sexual contact with someone who has hepatitis A
Although uncommon, hepatitis A can also spread through blood exposure. Casual contact at work, school, or social settings typically does not spread the virus.
Who Is at Risk for Hepatitis A?
Anyone can get hepatitis A, but certain groups have a higher risk of infection.
Travel-Related Risk
Hepatitis A is more common in some parts of the world, including:
- Africa
- Asia (excluding Japan)
- Eastern Europe
- The Middle East
- Central and South America
- Mexico
- Parts of the Caribbean
- The Mediterranean region
Other Risk Factors
You may be at increased risk if you:
- Live in or travel to areas experiencing hepatitis A outbreaks
- Serve in the military
- Use injectable or illicit drugs
- Have multiple sexual partners or engage in unprotected sex
- Have a bleeding disorder such as hemophilia
- Work in a daycare center
- Work in a nursing home, correctional facility, or other care setting
- Handle hepatitis A virus in a laboratory
- Work with primates that may carry the virus
- Have close contact with a child recently adopted from a country where hepatitis A is common
Because of its prevalence in certain regions, hepatitis A is sometimes referred to as a "traveler's disease."
What Are the Symptoms of Hepatitis A?
Symptoms often develop several weeks after exposure and can range from mild to severe.
Common symptoms include:
- Fever
- Chills
- Fatigue
- Loss of appetite
- Nausea and vomiting
- Abdominal pain
- Joint pain
- Dark urine
- Pale or clay-colored stools
- Diarrhea
- Rash
- Yellowing of the skin and eyes (jaundice)
Many adults experience symptoms, while most children younger than 6 years old have mild symptoms or none at all.
Because hepatitis A symptoms can resemble other illnesses, a medical evaluation is important for an accurate diagnosis.
How Is Hepatitis A Diagnosed?
A healthcare provider will review your symptoms, medical history, and potential exposure risks.
Diagnosis is confirmed through a blood test called IgM anti-HAV, which detects antibodies produced by the body in response to a recent hepatitis A infection.
How Is Hepatitis A Treated?
There is no specific cure for hepatitis A. Treatment focuses on relieving symptoms and supporting recovery while the body clears the infection.
Most people recover without hospitalization or extensive medical treatment.
Recovery Tips
If you have hepatitis A:
- Get plenty of rest
- Stay hydrated
- Eat a nutritious, balanced diet
- Take medications only as recommended by your healthcare provider
- Avoid alcohol until your liver has fully recovered
- Check with your healthcare provider before taking over-the-counter medications, including acetaminophen (Tylenol®)
Symptoms typically improve within a few weeks, although some people may experience fatigue and other symptoms for several months.
When Should You Call a Doctor?
Contact your healthcare provider if:
- Symptoms do not improve as expected
- Symptoms become more severe
- Symptoms disappear and then return
- You develop signs of dehydration or worsening jaundice
What Are the Complications of Hepatitis A?
Most people recover fully without complications.
In rare cases, hepatitis A can cause:
- Acute liver failure
- Severe liver damage
- Death
The risk of serious complications is generally higher in older adults and people with existing liver disease.
How Can Hepatitis A Be Prevented?
→ Practice good hand hygiene
Frequent handwashing is one of the most effective ways to prevent hepatitis A.
→ Wash your hands:
- After using the restroom
- After changing diapers
- Before preparing or eating food
- After caring for someone who is ill
→ Get vaccinated
The hepatitis A vaccine is the most effective protection against infection.
The vaccine contains an inactivated (killed) virus and cannot cause hepatitis A. After vaccination, your immune system produces antibodies that help protect against future infection.
→ Consider immune globulin
Immune globulin may be recommended before travel to high-risk areas or shortly after exposure to the virus. It provides temporary protection through antibodies that help fight infection.
Who Should Get the Hepatitis A Vaccine?
The hepatitis A vaccine is recommended for:
- All children age 1 and older
- International travelers to areas where hepatitis A is common
- Men who have sex with men
- People who use illicit drugs
- Healthcare and laboratory workers at risk of exposure
- Individuals with chronic liver disease
- People with bleeding disorders such as hemophilia
- Families adopting children from countries with higher rates of hepatitis A
Key Takeaway
Hepatitis A is a highly contagious liver infection, but it is also preventable. Vaccination, proper hand hygiene, and safe food and water practices can significantly reduce your risk. Most people recover completely, but early diagnosis and appropriate medical guidance can help prevent complications and support a smoother recovery.