There are physiological and pathological reasons for not having a morning erection, the former is mainly due to overexertion, the latter has hormones, disease-related, need to adjust work and rest, symptomatic treatment. Morning erection is to wake up in the morning after the penis is in the state of erection, mainly due to the process of sleep, parasympathetic nerve excitation caused by the expansion of penile arterial vasculature, the penis cavernous body of sufficient blood will cause the phenomenon of morning erection, but also may be due to the stimulation of the urge to urinate. Physiological reasons are ageing, recent overwork, often late at night, mental stress, need to adjust the work and rest, adequate rest, relaxation, more exercise to enhance physical fitness, quit smoking and drinking, etc. to make the morning erection automatically restored. Pathological causes include decreased androgen levels, excessive sexual activity, underlying diseases, and the effects of medication. Decrease in androgen level, such as testosterone secretion is insufficient, may cause no morning erection, need to be supplemented with androgen treatment. Excessive sex and frequent masturbation can cause morning erections to disappear, so it is recommended to reduce the frequency of sex and masturbation and maintain good habits. Some underlying diseases, such as cardiovascular disease, urological diseases, diabetes and so on, can also lead to the disappearance of morning erections, the need to actively treat the primary disease, reduce the impact on the morning erectile function, such as diabetes patients can take metformin and other drugs. There are also some antihypertensive drugs, hypoglycemic drugs, psychotropic drugs can also affect the erectile function, resulting in reduced frequency of morning erections. It is recommended to go to the regular hospital for relevant examination and comprehensive consideration of replacing drugs.