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What causes knee pain? 27 possible conditions

Knee pain is a frequent ailment that can be experienced by people of all ages. This type of body pain may take place immediately after an injury, or it may appear as an extension of a chronic medical condition.  Read more

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

1

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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2

Runner's Knee

Runner's knee is the common term used to describe any one of several conditions that cause pain around the kneecap. Read more about specific conditions.

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3

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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4

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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5

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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6

Dislocations

This condition is considered a medical emergency. Urgent care may be required.

Since a dislocation means your bone is no longer where it should be, you should treat it as an emergency and seek medical attention as soon as possible.

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7

Sprains & Strains

Sprains and strains are injuries to the body, often resulting from physical activity. These injuries are common and can range from minor to severe, depending on the incident. Most don't require medical attention.

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8

Fracture

This condition is considered a medical emergency. Urgent care may be required.

A fracture is a broken bone. Learn about the risk factors, symptoms, and treatments for different types of fracture.

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9

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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10

What is Fibromyalgia?

Fibromyalgia is a disorder tied to widespread pain in your muscles and bones, areas of tenderness, and fatigue. Learn about its symptoms, treatment, and more.

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11

Tendinitis

Tendons are thick cords that join your muscles to your bones. When these tendons become irritated or inflamed, it is called tendinitis. This condition causes acute pain and tenderness, making it difficult to move th...

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12

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.

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13

Ankylosing Spondylitis

Ankylosing spondylitis is a form of arthritis that primarily affects your spine. It causes severe inflammation of the vertebrae that might eventually lead to chronic pain and disability.

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14

Osteochondrosis

Osteochondroses directly affect the growth of bones in children and adolescents. Learn more about these disorders.

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15

What Is Osteoarthritis?

Osteoarthritis (OA) occurs when this cartilage (which provides a cushion for bones) wears away. It can occur in any joint in the body, but most commonly affects the knees, hips, spine, and hands.

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16

Arthritis

There are more than 100 different types of arthritis. Learn the basics and how your doctor might treat it.

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17

Bursitis

Bursae are fluid-filled sacs found about your joints. They surround the areas where tendons, skin, and muscle tissues meet bones. The lubrication they add helps reduce friction during movement.

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18

Gout Overview

Gout is a type of arthritis caused by too much uric acid in the blood. When the concentration of uric acid gets too high, sharp urate crystals form and collect in the joints, causing swelling and intense pain.

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19

Rheumatoid Arthritis Overview

Rheumatoid arthritis is an autoimmune disease. It causes joint problems. In autoimmune diseases, the immune system mistakes the body's own cells for invaders.

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20

Tendon Sheath Inflammation (Tenosynovitis)

Tendons are covered by a protective sheath called synovium, which keeps tendons lubricated. Injury to this area can disrupt this function, causing inflammation.

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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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