Penile contraction is generally a normal phenomenon, but it can not be ruled out that it is due to androgen secretion deficiency, impotence and other factors, you need to go to the hospital in a timely manner to seek medical attention, to clarify the cause of treatment. 1. Normal phenomenon: usually due to weight gain or cold stimulation, the penis may appear contraction, is a normal physiological phenomenon, without special treatment. 2. Insufficient androgen secretion: it may be due to endocrine disorders leading to a decrease in androgen levels, which reduces the excitability of the central nervous system, resulting in the phenomenon of penile contraction. 3. Impotence: usually caused by excessive masturbation, long-term anxiety and other causes of impotence, which results in the inability of penile erection or contraction. Patients can go to the hospital for medical examination when the penis contraction occurs, usually pay attention to penile hygiene, avoid excessive masturbation, once the symptoms of discomfort, to seek medical diagnosis in a timely manner.