The pyriformis muscle is deep in the buttocks and may trap the sciatic nerve in its course down the back of the leg.  This is often made worse by prolonged sitting (e.g., working at a computer), strenuous twisting of the torso (e.g., shoveling snow), or even by falling on one’s backside (e.g., the pyriformis muscle goes into spasm).  This may lead to lower backache, weakness of the hip (on the affected side), difficulty walking, pain down the back of the thigh, and numbness of the lower leg--in short, all the classic signs of a herniated disc....

Premenstrual syndrome, or PMS, is a female condition characterized by troublesome symptoms that begin one to two weeks before the menstrual cycle begins.  The syndrome affects nearly half of all American women between the ages of twenty and fifty....

The prostate is the most common site of disorders in the male genitourinary system.  The most significant disorders are prostatitis, benign hypertrophy of the prostate, and cancer. Symptoms of prostate problems include more frequent urination at night, difficulty in starting and stopping urination, decreased force of urine flow, and an accompanying burning sensation....