What should you know about lower knee swelling?

Swelling after a twist, pop, or sports injury can occur with an ACL Tear or Meniscus Tear. A soft fullness behind the knee may fit a Baker's Cyst. Swelling over the kneecap or at a pressure point can involve Knee Bursitis. A hot, suddenly swollen joint may occur with Gout or another inflammatory problem. Gradual stiffness with activity can occur with Knee Osteoarthritis. A clinician considers the exact location, warmth, range of motion, injury history, and ability to put weight through the leg.

Pause impact exercise and avoid kneeling while the knee is swollen. Rest the leg in a comfortable position, use gentle movement within an easy range, and elevate it when resting. A cold pack wrapped in cloth can help after a recent injury. Do not repeatedly force the knee to bend, drain the swelling yourself, or return to sport while walking or stairs are painful. If fluid limits movement, Joint Aspiration is a procedure a clinician may discuss after examination.

Seek urgent care for a hot red knee with fever, severe pain after an injury, a visible deformity, inability to bear weight, or a calf that becomes swollen and painful. Get prompt assessment if swelling follows a twist, keeps returning, or prevents normal bending and straightening. Sudden breathlessness or chest pain alongside leg swelling requires emergency help.

Ask what structure is swollen, whether the knee needs imaging, how much weight you may place on it, and which exercises are safe. Ask whether fluid testing or Joint Aspiration would clarify an inflammatory or infection-related cause.