Varicose veins are usually caused by venous valvular insufficiency and venous reflux disorder. 1. Venous valve insufficiency: Varicocele can be caused by venous valve insufficiency, for example, because of incomplete development of venous valves, incomplete closure of venous valves and other reasons that lead to the backflow of blood, inducing venous hypertension. 2. Obstruction of venous return: it may also be caused by obstruction of venous return, for example, because of suffering from Nutcracker syndrome, renal tumor, hydronephrosis and other diseases leading to proximal venous obstruction, causing obstruction of return and triggering venous hypertension. Patients with varicocele may experience symptoms such as swelling of the scrotum when standing, constant or intermittent pain in the scrotum, and pain that may radiate to the lower abdomen, inguinal area, and posterior lumbar region. The discomfort may worsen after exertion or prolonged standing. After the patient lies down and rests, the discomfort will be reduced or disappear. If you are diagnosed with varicocele, it is recommended that you go to the hospital in time for diagnosis and treatment, keep quiet recently, avoid overwork, and take good care of your private parts for a speedy recovery.