What should you know about leg knee swelling reasons?

Swelling after a twist, fall, or sudden change of direction can occur with an ACL tear or meniscus tear. A swollen, tender area over the kneecap can fit knee bursitis, while a soft fullness behind the knee may be a Baker's cyst. Gout can cause a rapidly painful, warm, red joint. Knee osteoarthritis more often causes swelling with stiffness and activity-related discomfort. A knee can also swell because extra fluid has collected inside the joint; swelling alone does not identify one cause.

Reduce activities that increase pain, keep the leg comfortably elevated, and use a wrapped cold pack for short periods if it helps. Avoid forcing a swollen knee through deep bending or impact exercise. Note when the swelling began, whether it followed an injury, and whether the knee feels hot, locks, gives way, or cannot fully move. A clinician may examine the joint and decide whether imaging or joint aspiration is useful.

Arrange prompt medical assessment for marked swelling after an injury, inability to bear weight, a locked or unstable knee, or swelling that keeps returning. Seek urgent care for a hot, red, very painful knee with fever or feeling acutely unwell, because an infection needs rapid evaluation.

Ask what findings point toward injury, crystal inflammation, bursitis, or osteoarthritis; whether you need imaging; and which activities are safe while the swelling settles. Ask how to respond if the knee locks, gives way, or becomes warm.