There are many causes of physical weakness, the main reasons are as follows: 1, physiological factors, such as overwork, excessive exercise, staying up late, stress, seasonal climate reasons, etc., psychological factors caused by physical exertion, through adequate rest can be effectively improved. 2, pathological factors, such as anemia, hypothyroidism, tumors, etc., consumptive diseases, chronic renal diseases, malnutrition, etc., pathological factors through adequate rest, also can not effectively relieve the symptoms, The pathological factors, such as anxiety, depression, neurasthenia, neurological syndrome, etc., need psychological guidance by a specialist and medication to effectively relieve the symptoms.