Lateral thigh muscle protrusion may be a normal phenomenon, may also be caused by disease. 1. Normal phenomenon: usually often fitness, leg exercise, will cause thickening of the thigh muscles, the performance of the muscle, prominent is a muscular performance, in addition, long-term sedentary people, or obese people may also be manifested in the lateral thigh muscle bulge. 2. Diseases caused by: damage to the cortical fibers, pelvic anterior displacement and other conditions may also lead to the phenomenon of lateral thigh muscle bulge. If it is a physiological phenomenon, generally do not need treatment, if there are uncomfortable symptoms, it is recommended that patients go to the hospital as soon as possible to check and timely diagnosis and treatment, and to develop good living and eating habits.