Toxic hepatitis occurs when liver develops inflammation because of exposure to a toxic substance, drugs and alcohol. It may also develop when you take too much of a prescription or over-the-counter medication. Mild forms of toxic hepatitis may not cause any symptoms and may be detected only by blood tests. Symptoms of toxic hepatitis include nausea and vomiting, rash, weight loss, dark or tea-colored urine. It occurs in the UK, but is more common in countries where sanitation and sewage disposal are poor. Around 350 cases are reported each year in England, with most cases occurring in people who have travelled abroad. It is estimated that around 215,000 people in the UK have chronic hepatitis.