The main causes of a small amount of fluid in the left hip are traumatic, infectious and autoimmune system disorders. Commonly used treatments include general treatment, physical therapy, medication and surgery. 1. Traumatic: aseptic inflammation of the hip joint due to heavy physical labor and prolonged exercise, should pay attention to more rest, avoid excessive exercise and weight bearing, choose non-steroidal drugs such as celecoxib, ibuprofen, etc. to alleviate the pain, as well as ultrashort wave, microwave, and other physical therapy modalities, to promote the absorption of the effusion. 2. Infectious: caused by bacterial infection, it can be accompanied by swelling, pain and activity limitation of the hip joint, and antibiotics such as penicillin and clindamycin should be used in sufficient quantity. Surgery should be performed when conservative treatment is ineffective. 3. Autoimmune system diseases: such as rheumatoid arthritis, should rest more, choose hot compresses, infrared and other physical therapy. Commonly used drugs include non-steroidal drugs such as diclofenac sodium and anti-rheumatic drugs such as lorazepam. Surgery may also be considered for severe symptoms. When you find a small amount of fluid in the left hip joint, you should actively cooperate with your doctor to check and clarify the cause of the disease, and standardize the treatment under the doctor’s guidance. The above drugs need to be used reasonably under the guidance of the doctor, avoid self-medication.