Battle against extremes

Many people in China may suffer from obsessive-compulsive disorder without knowing or admitting to it. Experts tell Wang Hongyi that these patients need professional help.

On, off; on, off; on, off. Even Xiao Tao (not her real name) herself doesn't know how many times she has to turn the water tap on and off. She also has to lock the door many times or her mind will wander and she will worry that something bad will happen.

The 28-year-old woman is "extremely tidy and clean" - she has to wash her hands frequently, often hundreds of times a day.