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Hepatitis B is contagious even when symptoms do not appear. According to the U.S. Centers for Disease Control and Prevention (CDC), about 30% of patients with chronic hepatitis show no signs or symptoms. Hepatitis B symptoms are less common in infants and children than adults. Symptomatic patients usually experience the first symptoms four to six weeks after infection, and they can range from mild to severe. Common symptoms include loss of appetite, nausea and vomiting, weakness and fatigue, abdominal pain (especially near the liver), dark urine, jaundice (yellowing of the skin and eyes) and joint pain.
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