A thought disorder is an abnormality in the amount and speed of associative thought activity. The clinical manifestations of thought disorders are diverse. Thought stagnation refers to the fact that the association is not easily developed, showing obvious inertia and always dwelling on the same problem. So what causes the disease? The patient’s cognition, emotion, will, action behavior and other mental activities can appear lasting obvious abnormalities; can not normal study, work, life,; action behavior is difficult to be generally understood; under the domination of the pathological psychology, there are suicidal or attack, injury to others action behavior. In other words, thought sticking is a disorder of mental activity disorder. It may be caused by birth defects or congenital heredity, such as depression and schizophrenia, or it may be caused by personal reasons, such as long-term alcohol dependence, emotional frustration, excessive stress, etc. In short, it is a complex disorder due to a variety of factors, mainly manifesting as abnormal thinking, variable emotions, and uncontrolled behavior. It is commonly seen in epilepsy, dementia or schizophrenia.