Hepatitis A

Hepatitis A is a highly contagious liver infection caused by the hepatitis A virus. The virus is one of several types of hepatitis viruses that cause inflammation and affect your liver's ability to function.

You're most likely to contract hepatitis A from contaminated food or water or from close contact with someone who's infected. Mild cases of hepatitis A don't require treatment, and most people who are infected recover completely with no permanent liver damage.

Practicing good hygiene, including washing hands frequently, is one of the best ways to protect against hepatitis A. Vaccines are available for people most at risk.

Symptoms

Hepatitis A signs and symptoms, which typically don't appear until you've had the virus for a few weeks, may include:

1. Fatigue
2. Nausea and vomiting
3. Abdominal pain or discomfort, especially in the area of your liver on your right side beneath your lower ribs
4. Clay-colored bowel movements
5. Loss of appetite
6. Low-grade fever
7. Dark urine
8. Joint pain
9. Yellowing of the skin and eyes (jaundice)

If you have hepatitis A, you may have a mild illness that lasts a few weeks or a severe illness that lasts several months. Not everyone with hepatitis A develops signs or symptoms.

When to see a doctor

Make an appointment with your doctor if you have signs or symptoms of hepatitis A.

If you've been exposed to hepatitis A, having a hepatitis A vaccine or immunoglobulin therapy within two weeks of exposure may protect you from infection. Ask your doctor or your local health department about receiving the hepatitis A vaccine if:

• You've traveled internationally recently, particularly to Mexico or South or Central America, or to areas with poor sanitation
• A restaurant where you recently ate reports a hepatitis A outbreak
• Someone close to you, such as someone you live with or your caregiver, is diagnosed with hepatitis A
• You recently had sexual contact with someone who has hepatitis A.

Causes

The hepatitis A virus, which causes the infection, usually is spread when a person ingests even tiny amounts of contaminated fecal matter. The hepatitis A virus infects liver cells and causes inflammation. The inflammation can impair liver function and cause other signs and symptoms of hepatitis A.

Hepatitis A virus can be transmitted several ways, such as:

• Eating food handled by someone with the virus who doesn't thoroughly wash his or her hands after using the toilet
• Drinking contaminated water
• Eating raw shellfish from water polluted with sewage
• Being in close contact with a person who's infected — even if that person has no signs or symptoms
• Having sex with someone who has the virus

Risk factors

• Travel or work in regions with high rates of hepatitis A.
• Attend child care or work in a child care center.
• Are a man who has sexual contact with other men.
• Are HIV positive.
• Have a clotting-factor disorder, such as hemophilia.
• Use injected or non injected illicit drugs.
• Live with another person who has hepatitis A.
• Have oral-anal contact with someone who has hepatitis A.

Complications

Unlike other types of viral hepatitis, hepatitis A does not cause long-term liver damage, and it doesn't become chronic.

In rare cases, hepatitis A can cause loss of liver function that occurs suddenly, especially in older adults or people with chronic liver diseases. Acute liver failure requires hospitalization for monitoring and treatment. Some people with acute liver failure may require a liver transplant.

Test and Diagnosis

Blood tests are used to detect the presence of hepatitis A in your body. A sample of blood is taken, usually from a vein in your arm, and sent to a laboratory for testing.

Treatments and drugs

No specific treatment exists for hepatitis A. Your body will clear the hepatitis A virus on its own. In most cases of hepatitis A, the liver heals within six months with no lasting damage.

Hepatitis A treatment usually focuses on coping with your signs and symptoms. You may need to:

• Rest. Many people with hepatitis A infection feel tired and sick and have less energy.
• Cope with nausea. Nausea can make it difficult to eat. Try snacking throughout the day rather than eating full meals. To get enough calories, eat more high-calorie foods. For instance, drink fruit juice or milk rather than water.
• Rest your liver. Your liver may have difficulty processing medications and alcohol. Review your medications, including over-the-counter drugs, with your doctor. Don't drink alcohol while infected with hepatitis.

Source : 

http://www.mayoclinic.org/