Anterolateral thigh protrusion can be caused by physiological reasons such as exercise, or by pathological reasons such as anterior pelvic shift. 1. Physiological reasons: people who often work out because of the large amount of leg exercise, will cause muscle thickening, thigh anterolateral muscles developed and protruding. People with sedentary habits, sedentary will make the front lateral thigh muscles are more developed, while the back side of the thigh flaccid, front and back side of the muscle strength is not equal, will also lead to the front lateral thigh protruding. 2. Anterior pelvic shift: incorrect posture will lead to anterior pelvic shift, so that the muscles of the anterior thighs are more tense, while the muscles of the posterior thighs are more flaccid, also due to the anterior and posterior side of the muscle strength is not equal, and cause the anterolateral thighs to protrude. In addition, if the anterolateral thigh muscles have trauma, infection or localized blood clots, it can also lead to swelling and protrusion of the thigh. If there is a protrusion of the anterolateral thigh, you should go to the orthopedic department of the hospital in time to find out the cause of the disease and carry out standardized treatment under the guidance of the doctor.