Hepatitis
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Hepatitis is any of several liver diseases characterised by inflammation, liver enlargement, jaundice, fever and abdominal pain. The commonest are known as hepatitis A, hepatitis B, and hepatitis C; all three of these are caused by viruses that can be transmitted sexually, by blood transfusion, or by shared syringes. The incubation period for hepatitis C appears to be somewhere between 10 and 20 years, and researchers estimate that millions of people are infected and have not yet displayed any symptoms.