The paroxysmal pain at the root of the right thigh under the perineum in men is considered to be caused by varicocele, urethral stone, lymphadenitis and other diseases. 1. Varicose veins of the spermatic cord: due to congenital developmental abnormalities of the spermatic cord veins, venous return obstacles and other factors caused by blood stagnation, resulting in local venous dilatation, tortuous, most patients do not have any obvious discomfort, but those who are symptomatic, there may be a heavy scrotum, cramps and pain and other symptoms, and the pain will be radiated to the affected side of the groin and the perineum, the patient may be self-conscious of perineum connected with the root of the right thigh paroxysmal pain. 2. Urethral stones: mostly due to kidney stones and bladder stones discharged into the urethra and stay in the urethra, or due to abnormal metabolism and other factors that lead to the formation of stones directly in the urethra, urethral stone patients will appear in urinary effort, hematuria, and other phenomena, and there will be severe pain in the perineum, often radiating to the head of the penis, and some patients conscious of the perineum under the connection with the root of the right thigh paroxysmal pain. 3. Lymphadenitis: it is caused by the invasion of lymph nodes by pathogenic bacteria or nearby foci of infection, lymphadenitis patients will have symptoms such as swelling and pain in the lymph nodes of the neck, groin and other parts of the body, and the patients may consciously feel paroxysmal pain under the perineum connecting to the root of the right thigh. In addition, there are many other causes can cause perineum connected to the root of the right thigh paroxysmal pain, it is recommended that patients go to the hospital in a timely manner, clear the cause of the disease, as soon as possible to receive treatment.