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When to seek medical advice
By Mayo Clinic staffIf you're experiencing pain and swelling behind your knee, see your doctor to determine the cause. Treating the underlying condition, such as arthritis or a cartilage tear, usually relieves the swelling and discomfort of a Baker's cyst.
Though unlikely, a bulge behind your knee may be a tumor or a popliteal artery aneurysm rather than a fluid-filled cyst.
