A Baker’s cyst, also known as a popliteal cyst or synovial cyst, is a soft, fluid-filled lump that forms on the back of your knee.
When structures in or around the joint are damaged, your knee produces extra fluid that can only flow one way so it forms a cyst on the back of your knee.
Sometimes you’ll feel no pain at all, or only a slight pain with a Baker’s cyst.
Any strain can cause this lump or your knee to swell in size. When the knee or cyst swells, this can increase your pain and limit how much you can move your knee.
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