强迫症的英文表达是 obsessive-compulsive disorder（OCD）。这种心理疾病的症状包括强迫性地进行某些特定的行为或思维活动。例如：

洗手或清洁过度

重复某些动作或说话

难以控制自己对某些事情的担忧或焦虑

OCD可能是由多种因素引起的，包括遗传因素、神经生物学因素、环境因素以及生活事件的影响。例句：

OCD sufferers may have a chemical imbalance in the brain that affects the way they think and behave.

Many people with OCD have to cope with daily challenges and intrusive thoughts that interfere with their ability to function normally.

Treatment for OCD often involves a combination of therapy, medication, and lifestyle changes to help individuals manage their symptoms and improve their quality of life.