The first conscious symptom of femoral head necrosis is pain, which is around the hip joint, inner thigh, anterior side or knee. In the early stage, the pain starts as vague, aching, dull or intermittent pain, which is aggravated by activities and can be relieved or reduced by rest. However, there are also cases of persistent pain. If there is a history of hip trauma, long-term or heavy application of corticosteroids or long-term alcohol abuse, hip pain, pressure pain at the stopping point of the adductor muscle, limited hip abduction, external rotation or internal rotation, and word test (+), even if no obvious changes are found on radiographs, CT or MRI should be performed, and bone marrow aspiration or angiography should be performed if necessary, in order to make early diagnosis and provide favorable timing for clinical treatment.