Penile spasm is not very common in the clinic, and the causes of this condition mainly include the following aspects, namely abnormal nerve function, inflammation around the penis and mental factors. 1. Abnormal nerve function: Infection or arteriosclerosis and other causes of nerve damage, will cause abnormal innervation function, further leading to penile spasm. 2. Inflammation around the penis: common as chronic prostatitis, because of the long time local stimulation, may cause local tissue structure abnormality, in the process of ejaculation caused by penile spasm, pain and discomfort. 3. Mental factors: emotional tension, mental anxiety can cause somatization, further leading to the symptoms of involuntary spasm around the penis. Penile spasms recurring, affecting the status of coitus, the need for timely medical observation, diagnosis of specific conditions, after the clinician under the guidance of standardized treatment, to avoid delays in the condition.