A morning erection is a natural erection that occurs without consciousness in men at a certain time, usually between 4:00 and 7:00 a.m. However, the exact mechanism of morning erections and the reasons for their production are still inconclusive. It is possible that morning erections are either Yang or Yin deficiency, and it is impossible to clinically determine whether the organism is Yang or Yin deficient based on this performance alone. According to Chinese medicine, the lack of morning erection is mainly related to kidney deficiency, but it should be combined with other manifestations of the patient to determine whether it is kidney yang deficiency or kidney yin deficiency. Kidney yang deficiency is generally seen as fear of cold, especially below the waist and knees, soreness and coldness, decreased libido, impotence and premature ejaculation in men, easy spermatorrhea, increased nocturnal urination, unshaped stools, depression, weakness, easy sleepiness, dull tongue, fat tongue, white coating; kidney yin deficiency is generally seen as soreness and weakness in the waist and knees, dizziness and dullness, mental sleepiness, tinnitus, loose teeth, severe hair loss, easy spermatorrhea and premature ejaculation in men, reduced stools The number of bowel movements is reduced and dry. Frequent insomnia, dreaminess, forgetfulness, dry mouth and throat, irritability, red tongue, dry tongue with little fluid or little moss. Therefore, no morning erection can not be judged as yin deficiency or yang deficiency, the specific should be clearly diagnosed by the clinician according to the individual situation identification, do not blindly supplement the kidney, no morning erection and a variety of factors related to the cause should be clear, the cause of treatment, follow medical advice.