Difficulty in getting an erection during the day and frequent erections in the middle of the night may be caused by physiological factors such as overwork, frequent masturbation, or considered to be due to erectile dysfunction, prostatitis and other diseases. 1. Physiological factors: if overwork, frequent masturbation, mental tension, too much pressure, may lead to erection difficulties, some people may appear in the daytime erection difficulties, often in the middle of the night erection situation. 2. Erectile dysfunction: Erectile dysfunction may be caused by lack of sexual knowledge, bad sexual experience, atherosclerosis, arterial injury, arterial stenosis, surgery, trauma, drugs and other factors. Patients may experience symptoms such as slow erection, or insufficient erection hardness, and some patients may show difficulty in erection during the day and frequent erection in the middle of the night. 3. Prostatitis: Prostatitis may be caused by pathogen infection, irregular sex life, sedentary, spicy diet and other factors. Patients may experience symptoms such as decreased libido, erectile dysfunction, and premature ejaculation, which are manifested as difficulty in daytime erection and frequent erections in the middle of the night. If the patient has difficulty in erection during the day and frequent erection in the middle of the night, he should go to the regular hospital for relevant examination so as to clarify the cause of the disease.