Jumping at the root of the penis may be caused by too tight underwear, inflammatory stimulation, varicocele and other reasons. 1. Too tight underwear: when some men often wear tight underwear, it may cause extrusion to the penis and make the penis root jumping performance. This is a common physiological phenomenon, attention should be paid to timely replacement of loose underwear. 2. Inflammatory stimulation: Inflammation can be caused by bacterial infection in the penile area, and after being stimulated by inflammation, the patient’s penile root can have pain and swelling and other symptoms, which can also induce the performance of penile root throbbing. 3. Varicose veins: Varicose veins can be induced by prolonged sedentary behavior or impaired venous return. With this disease, the patient may not be able to discharge semen normally and the penis pain performance, can also induce the penis root throbbing. Penile root throbbing may also be caused by other reasons, such as urethral stenosis, etc. You should go to the hospital in time to clarify the cause of the disease and choose the appropriate method of treatment.