Various ailments, diseases, and injuries can cause knee pain. Identifying the underlying cause and type of knee pain can help the affected individual and medical practitioners better determine treatment and facilitate recovery. Knee pain can present along with various symptoms and signs.
The cause of swelling of the knee is usually fluid around the joint limiting movement and flexibility. The skin around the knee becomes tight and stretched, tender to the touch, and pink or red. The swelling causes pain in the knee, and the buildup of fluid may make it difficult to put weight on that knee. The injured individual may have trouble bending or straightening the knee completely, and the kneecap may appear puffed up. Comparing the painful knee to the uninjured one can help determine the extent of the inflammation.
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