Men’s inability to get a hard penis is common in life and is medically known as impotence. It is a condition in which the penis cannot get erect normally during sexual intercourse under sexual stimulation. The erection of the penis is mainly completed by the cavernous body filling with blood, the most fundamental cause of male hardness is the cavernous body of the penis is not filled with blood, related to the psychological role of men, disease, life and rest. For example, men are too nervous during sex, anxiety, depression, husband and wife relationship discord, will cause the penis vasoconstriction, resulting in the cavernous body underfilled with blood caused by impotence. Diseases that cause impotence include chronic hypertension and diabetes, which can cause arterial narrowing and atherosclerosis of the penis, thus affecting the normal blood supply to the penis and causing men to become hard. Also related to men’s long-term overwork, excessive psychological stress, long-term late night and other irregular habits, impotence to seek medical attention in a timely manner to avoid delays in the condition and treatment.