There are many aspects of the reasons why men have no spirit, as follows: 1, if a young male patient is always no spirit to consider is chronic fatigue syndrome, neurological weakness. This category of patients usually exist in the long-term lack of sleep, low quality of sleep, or usually less activity, poorer physical fitness, but also prone to fatigue, always want to sleep, no mental symptoms; 2, if the elderly are not mental, there are many aspects of the reason, may be caused by neurological weakness, but also may be caused by some physical diseases. For example, fever when the patient has an infectious disease can cause the patient to have no energy and depression, or because of the narrowing of the blood vessels in the cerebral arteries, serious deficiency of blood supply to the brain, hypertension, hypotension, hypoglycemia and other diseases, can cause the male patient to have no energy and weakness.