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A build-up of fluid in a joint can be among the first symptoms of arthritis. As fluid builds up, the joint becomes swollen. A small amount of fluid exists in a normal joint but an excessive amount is symptomatic and must be treated.

We asked Dr. Scott Zashin, a rheumatologist, to explain joint effusion as well as the importance of draining the fluid and testing the fluid. Joint effusion is also referred to as "water on the knee" or "fluid on the knee". Read Dr. Zashin's answer to our question What Is Joint Effusion?

Photo by Roberto Adrian (iStockphoto)

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