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10. Injury

Hemarthrosis is the technical term for blood inside a joint. This usually happens as a result of injury, which prompts a rapid increase in the production of synovial fluid. This causes pain at the time of injury, but cells called phagocytes absorb the blood within a few days. Fat can also enter the joint if the synovial membrane is torn -- this is more difficult for the body to remove. Joints can recover from minor injuries on their own, but severe injuries may require medical intervention.

injuries synovial fluid toeytoey2530 / Getty Images
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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.