There are many reasons why the penis cannot erect normally: first, it may be caused by psychological effects, such as excessive anxiety, tension and depression in sexual life, as well as marital discord and excessive work pressure. Secondly, it may be caused by too frequent sexual life, kidney deficiency and excessive masturbation. Thirdly, it may be caused by pathological reasons, such as metabolic diseases such as diabetes and hypertension, which may cause erectile dysfunction. It is necessary to go to the urological department of the hospital as early as possible for examination, and then treat according to the examination results.