Pain at the root of the thigh when squatting, is the hip inguinal position, may be caused by the following reasons. 1, hip arthritis, is a sterile inflammation of the hip joint, pain will appear or aggravate when the joint is active, pain will be relieved when resting, if the local inflammation is more serious, it will also lead to local skin flushing, skin temperature increases and other symptoms of redness, swelling and heat. 2, femoral head necrosis, early symptoms The symptoms are similar to those of hip arthritis, and the symptoms are more serious in the middle and late stages. The collapse of the femoral head after necrosis causes the limb to shorten and deform, and the pain increases when bearing weight or walking. You can go to the hospital to check the local X-ray, hip CT, MRI is able to confirm the diagnosis.