If both sides of the iliac bone are protruding without other uncomfortable symptoms, it is mostly considered to be caused by the protrusion of the anterior superior iliac spine. If the patient is accompanied by local pain and other uncomfortable symptoms, it may be caused by hip synovitis, hip dislocation and other diseases. 1. Anterior superior iliac spine protrusion: both sides of the ilium need to be considered firstly as anterior superior iliac spine protrusion, and the anterior superior iliac spine protrusion is more obvious in those who have a thin body type. If it is not accompanied by physical discomfort, it is a normal phenomenon and there is no need to worry too much. 2. Hip synovitis: Hip synovitis may be caused by trauma, infection, intra-articular injury and other factors. Patients may experience symptoms such as swelling and pain in the hip, and in severe cases, the iliac bone may protrude from both sides. 3. Hip dislocation: Hip dislocation may be caused by factors such as falling from height and traffic accidents. Symptoms of hip joint swelling, pain, activity disorders, can feel the head of the femur in the hip, some patients will appear iliac bone protruding on both sides of the situation. There are many other causes of iliopsoas protrusion, and it is recommended that patients consult the hospital in time to find out the cause of the disease and standardize the treatment.