Hepatitis A Infection
What is Hepatitis A infection?
Hepatitis A is a viral infection that attacks your liver and causes inflammation. The virus spreads through contaminated food, water, or close contact with an infected person. Unlike other forms of hepatitis, Hepatitis A does not cause chronic or long-term liver disease.
Most people recover fully within a few weeks to months without lasting damage. Your immune system clears the virus completely, and you develop lifelong immunity afterward. However, the illness can be serious and disrupt your daily life for several weeks.
Hepatitis A is preventable through vaccination and good hygiene practices. The infection is more common in areas with poor sanitation or limited access to clean water. Travelers to certain countries face higher risk of exposure.
Symptoms
- Yellowing of the skin and eyes, called jaundice
- Extreme fatigue and weakness
- Nausea and vomiting
- Loss of appetite
- Dark urine and pale stools
- Stomach pain, especially in the upper right side
- Fever and muscle aches
- Itchy skin
Some people, especially young children, may have mild symptoms or no symptoms at all. Adults typically experience more severe illness than children. Symptoms usually appear 2 to 6 weeks after exposure to the virus.
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Causes and risk factors
Hepatitis A spreads when you ingest the virus through contaminated food or water. This happens most often through food prepared by someone with Hepatitis A who did not wash their hands properly. You can also get infected through close personal contact with someone who has the virus, including sexual contact. Raw or undercooked shellfish from contaminated waters can carry the virus.
Risk factors include traveling to countries where Hepatitis A is common, using recreational drugs, living with or caring for someone with Hepatitis A, and working in childcare or healthcare settings. Men who have sex with men face higher risk. People with clotting factor disorders and those experiencing homelessness also have increased exposure risk.
How it's diagnosed
Doctors diagnose Hepatitis A through blood tests that look for specific antibodies your immune system makes to fight the virus. The Hepatitis A antibody test can detect both active infections and past exposure. Your doctor may also order liver function tests to check how well your liver is working during the infection.
If you think you have been exposed to Hepatitis A or have symptoms, see a doctor right away. Early diagnosis helps you manage symptoms and prevent spreading the virus to others. Talk to our doctor about testing options and next steps for proper care.
Treatment options
- Get plenty of rest to help your body fight the infection
- Stay hydrated by drinking water and clear fluids throughout the day
- Eat small, frequent meals if nausea makes eating difficult
- Avoid alcohol completely, as it puts extra stress on your liver
- Avoid medications that can harm the liver, including acetaminophen
- Practice careful hygiene to prevent spreading the virus to others
- Follow up with your doctor regularly to monitor liver function
There is no specific medication to treat Hepatitis A. Your body will clear the virus on its own over time. Most people recover completely within 2 months, though some may feel tired for up to 6 months. If you were exposed recently, a vaccine or immunoglobulin shot within 2 weeks may prevent infection.
Frequently asked questions
Most people recover from Hepatitis A within 2 months of becoming sick. Some people may feel tired and have mild symptoms for up to 6 months. Once you recover, you have lifelong immunity and cannot get Hepatitis A again.
Yes, Hepatitis A can be prevented through vaccination. The vaccine is very effective and provides long-term protection. Practicing good hygiene, washing hands thoroughly, and avoiding contaminated food and water also help prevent infection.
Yes, Hepatitis A is highly contagious. The virus spreads through close personal contact and contaminated food or water. People are most contagious about 2 weeks before symptoms appear until 1 week after jaundice develops.
The CDC recommends the Hepatitis A vaccine for all children at age 1, travelers to certain countries, people with chronic liver disease, and people at higher risk due to lifestyle or work. Talk to your doctor about whether you need the vaccine.
Raw or undercooked shellfish, fresh fruits and vegetables, and any food handled by an infected person can carry Hepatitis A. Frozen and canned foods are generally safe. Always wash produce thoroughly and cook shellfish completely.
Hepatitis A rarely causes permanent liver damage. Most people recover fully with no lasting effects. In rare cases, usually in older adults or people with existing liver disease, Hepatitis A can cause acute liver failure.
Hepatitis A is an acute infection that always resolves on its own and does not become chronic. Hepatitis B and C can become chronic and cause long-term liver damage. Hepatitis A spreads through contaminated food and water, while B and C spread through blood and body fluids.
See a doctor if you develop symptoms of Hepatitis A or if you were exposed to someone with the infection. Seek immediate care if you have severe vomiting, signs of dehydration, confusion, or severe abdominal pain. These may indicate serious complications.
You should stay home from work or school until at least 1 week after jaundice appears or as your doctor recommends. This helps prevent spreading the virus to others. Food handlers and healthcare workers may need to stay home longer.
The Hepatitis A antibody test checks for proteins your immune system makes in response to the virus. A positive test can mean you have an active infection, recently recovered, or were vaccinated. Your doctor will interpret results based on your symptoms and history.