A small amount of fluid in the hip joint may be caused by synovitis, manifested as local pain, but no obvious fever and joint swelling performance, before the onset of the disease usually have a history of colds or strenuous exercise. The main thing is to rest and recuperate and avoid walking around. If it is accompanied by pain, you can take oral painkillers, such as Ereximus tablets. It may also be early necrosis of the femoral head or degenerative osteoarthritis of the hip joint, which is manifested by repeated hip pain, especially after long distance walking, and can be determined by MRI. Other causes such as hip synovial tuberculosis and early septic hip osteoarthritis are also possible, with symptoms of local fever and generalized fever, more intense pain and fluid accumulation that may worsen with the progress of the disease, which can be determined with the aid of hip MRI, blood count, blood sedimentation and tuberculin test.