What causes fluid accumulation in the knee?

The knee may refer to the knee joint. Knee joint effusion could be caused by normal physiological responses, drug irritation, intra-articular fractures, rheumatoid arthritis, gout, and other reasons. It is recommended to seek medical attention promptly, identify the underlying cause, and receive symptomatic treatment under the guidance of a qualified physician. Specific analyses are as follows:

1. Normal response: After intense physical activity, such as prolonged exercise, the synovial membrane within the knee joint may secrete mucus to lubricate the joint, thereby reducing friction and wear on the articular cartilage. This is a normal physiological phenomenon. The amount of fluid produced is usually small and will naturally be reabsorbed after rest, requiring no special intervention.

2. Drug irritation: Some patients may develop bloody joint effusion after using anticoagulant medications, such as aspirin enteric-coated tablets, warfarin sodium tablets, or clopidogrel hydrogen sulfate tablets.

3. Intra-articular fracture of the knee: When the knee joint suffers external trauma, local fractures may occur, which can easily lead to hemarthrosis (blood accumulation in the joint), along with symptoms such as joint swelling and pain. It is recommended that patients follow medical advice and use medications such as celecoxib capsules, heparin sodium injection, and vitamin AD soft capsules for treatment.

4. Rheumatoid arthritis: This condition may be associated with factors such as living in a damp environment or microbial infection. Local inflammation may increase synovial secretion in the joint, leading to effusion, as well as symptoms like joint pain and swelling. Patients are advised to follow medical instructions and use medications such as Qingpeng ointment, diclofenac sodium sustained-release tablets, and methylprednisolone tablets for treatment.

5. Gout: This may result from excessively high uric acid levels in the blood, causing uric acid deposition in the joint cartilage. This can stimulate the synovial membrane to produce inflammatory fluid, accompanied by redness and swelling of the joint. Patients should use medications such as benzbromarone tablets, colchicine tablets, and allopurinol tablets under a doctor's supervision to improve symptoms.

In daily life, patients are advised to consume alkaline foods such as tofu and tomatoes appropriately, maintain sufficient sleep, avoid staying up late, and engage in moderate physical activities such as tai chi or walking, which may benefit recovery.