Hip swelling and pain can be caused by the following reasons: First, sciatica caused by pyriformis syndrome, there can be swelling and pain around the pyriformis muscle at the sciatic node, accompanied by numbness and pain in the lower limbs, then we should have an early checkup and check the neuromuscular electromyography of the lower limbs for diagnosis and early treatment. Secondly, tumor, when there is tumor in the soft tissue and bone of the hip, it can have the symptom of swelling and pain in the hip, and at the same time, the local swelling can be touched, at this time, it is necessary to have early checkup, early examination of MRI and CT to diagnose the tumor, and if necessary, surgery, and do the pathology after removing the swelling for further diagnosis. Third, cold, when the hip is cold, there can be muscle soreness, discomfort, pain symptoms, then we should get out of the cold environment at an early stage, pay attention to keep warm and physical therapy.