The front of the thigh is the location of the quadriceps muscle, thigh bulge forward one should consider physiological reasons, such as fat accumulation in the thigh, quadriceps muscle developed; the second is to consider pathological reasons, such as varicose veins, myocardial hernia, femoral stem deformity, tumors and so on. 1. Physiological reasons: If the front of both thighs are symmetrically prominent, it is considered that the fat accumulation in the front of the thighs may be more obvious. In addition, it is also possible that the quadriceps muscle in front of the thigh is thickened and thickened for a long time, which is stronger and stronger, and is manifested as a bulge in front of the thigh. 2. Pathological causes (1) varicose veins: varicose veins when venous blood in the superficial veins stagnation, vascular varicose manifested in the surface of the obvious bulging, may be manifested in the thigh protruding. (2) Myofascial hernia: myofascial injury can cause the muscle to come out of the fascia and become a myofascial hernia, appearing as a bulge of the thigh forward. (3) Femoral stem deformity: when femoral stem fracture condition occurs and there is deformity, the fracture end protrudes forward and also appears as protrusion of the front of the thigh. (4) Tumor: Tumor on the front of thigh, such as lipoma with large tumor size, will have the manifestation of thigh protruding obviously. There may be other reasons for thigh bulging forward, it is recommended to go to the hospital in time to improve the examination and clarify the cause of the disease.