Acute attack of hip synovitis refers to the obvious damage to the synovium around the hip joint as well as the obvious redness, swelling, heat and pain changes in the joint, which may be caused by over activity, infection, trauma and other factors. Acute attack of hip synovitis can be understood as the acute phase of hip synovitis, mainly manifested as extensive and obvious damage to the synovial membrane of the hip joint, redness, swelling, pain and other inflammatory changes in the joint, and in severe cases, it can also manifest as a limitation of activities. The pathogenesis of hip synovitis is still unclear. The etiology can be excessive activity of the hip joint, infection, trauma and other factors, such as excessive activity of the hip joint or direct trauma, which can cause a large amount of joint fluid from the synovial membrane exudation, an acute attack of hip synovitis; the presence of infection foci in the organism, can be due to infection caused by the immune response to an acute attack of hip synovitis, and so on. Acute attack of hip synovitis, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment, so as not to delay the condition.