The causes of neurasthenia are mainly the following three: First, excessive brain fatigue and tension. For example, due to the heavy burden and stress of work and study, the need for long hours of highly concentrated brain, or at the expense of rest time, overload work, resulting in serious sleep deprivation, resulting in disruption of sleep rhythm. It can also be due to work that is difficult and exceeds the actual capacity, feeling self-doubt and anxiety for not being able to complete the work successfully. Long-term sustained tension and fatigue lead to disorder of excitation and inhibition of the brain, thus inducing neurasthenia. Second, negative emotional experience. Such as long-term psychological conflict and trauma, is an important cause of the occurrence of the disease. For example, interpersonal tensions, career setbacks, loss of a loved one, untold internal conflicts, etc. These factors make patients feel depressed, aggrieved and resentful for a long time, thus predisposing them to neurasthenia. Third, personality characteristics. Mainly characterized by aloofness, introversion, timidity or suspiciousness, sensitivity, or anxiety, irritability, poor self-control, easily lead to tension or poor interpersonal relations, etc.. Because of the special personality character of neurasthenia, poor psychological stress capacity, poor social adaptability, easy to form internal conflicts, etc., these are the inherent basis and cause of neurasthenia.