Fluid accumulation in foot joints may be caused by external injury, chronic strain, joint inflammation, etc. Depending on the cause, it can be eliminated by local braking, physical therapy and medication. 1. External injury: If the foot joints are injured accidentally when doing strenuous activities or heavy physical labor, resulting in local blood vessel rupture, bleeding, and producing corresponding bloody effusion. It is necessary to carry out local braking in time and reduce weight-bearing activities, which can reduce the production of fluid in the joint. After the acute stage, it can be relieved by hot compresses. 2. Chronic strain: If there is persistent chronic strain on the foot joints, it may lead to vascular damage, inflammatory cells and inflammatory mediators will leak out into the joints, resulting in inflammatory effusion. Attention should be paid to rest, minimize the local stimulation, local braking can be carried out to avoid local trauma. Physiotherapy methods such as hot compresses, grilling and massage can also be used to relieve symptoms. 3. Joint inflammation: If the patient has arthritis in the joints of the feet, such as rheumatoid arthritis, synovitis, etc., due to immune factors leading to inflammation of the joints, producing inflammatory effusion. If the symptoms are mild, they can be relieved by hot compresses and massage. If the symptoms are more severe, oral non-steroidal anti-inflammatory drugs such as etoricoxib, diclofenac sodium, celecoxib, etc. can be taken to help relieve joint pain and swelling. Fluid buildup in the joints of the feet is recommended to be treated under the guidance of a doctor.