Hidden pain above the left hip bone can be caused by trauma, lumbar muscle strain, gynecological inflammation and ankylosing spondylitis. 1. Trauma: Trauma to the upper part of the left hip bone, so that the local soft tissue damage, can lead to local swelling, hidden pain and other symptoms. When the injury is serious, it can lead to hip fracture or dislocation, and the pain symptoms will be more intense, accompanied by obvious limitation of activities. 2. Lumbar muscle strain: lumbar muscle strain can also lead to vague pain above the left hip bone, mainly due to the lumbar muscle fatigue injury caused by long-term activities, in addition to the vague pain above the left hip bone can also be localized symptoms such as limited mobility. 3. Gynecological inflammation: when women have pain above the hip bone, it may be caused by gynecological inflammation such as pelvic inflammatory disease, cervicitis, etc. In addition, it will be accompanied by chills, high fever, headache and other systemic reactions. 4. Ankylosing spondylitis: Ankylosing spondylitis can cause cartilage destruction of sacroiliac joints and vague pain in the left sacroiliac joint. When there is pain above the left hip bone, you should consult a doctor in time. After the specialist makes a clear diagnosis and excludes whether there is iliac bone fracture and iliac bone tumor, appropriate treatment will be carried out, which will help to improve the symptoms of pain and discomfort as soon as possible.