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Let's see if we can figure out what's causing your swollen knee.
Select additional symptoms and we'll narrow your results.

What causes swollen knee? 7 possible conditions

See a list of possible causes in order from the most common to the least.

1

Osgood-Schlatter Disease

Osgood-Schlatter disease is an inflammation of the area just below the knee. Learn about the symptoms, diagnosis, and treatment for this disease.

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2

Meniscus Tear of the Knee

The meniscus is a piece of cartilage that provides a cushion between your thighbone (femur) and shinbone (tibia). There are two menisci in each knee joint.

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3

Medial Collateral Ligament Injury of the Knee (MCL Tear)

An injury to the medial collateral ligament (MCL) is often called an MCL sprain. Ligament injuries can either stretch the ligament or tear it.

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4

Anterior Cruciate Ligament (ACL) Tear

A tear in your anterior cruciate ligament (ACL) can cause pain and swelling. Learn symptoms and treatment options.

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5

Sports Injuries

Learn about common injuries that occur in the major regions of the body when playing sports, including concussions, neck strain, torn rotator cuffs, tennis elbow, golfer's elbow, wrist sprains, back pain, hip injuries...

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6

Posterior Cruciate Ligament Injury

The posterior cruciate ligament (PCL) runs along the back of the knee and can be strained, sprained, or torn.

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7

Baker's (Popliteal) Cyst

A popliteal cyst, also known as a Baker's cyst, is a fluid-filled swelling that causes a lump at the back of the knee.

Read more »

This feature is for informational purposes only and should not be used to diagnose.
Please consult a healthcare professional if you have health concerns.
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