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What causes joint swelling, joint tenderness and knee pain? 8 possible conditions

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

1

What Is Osteoarthritis?

Osteoarthritis (OA) occurs when cartilage that cushions bones at the joints wears away. Learn about symptoms and treatment options for OA.

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2

Arthritis

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

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3

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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4

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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5

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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6

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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7

Gout Overview

More than 8 million Americans experience gout, a condition that causes painful inflammation in the joints. Learn more about gout.

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8

Juvenile Rheumatoid Arthritis

Juvenile rheumatoid arthritis is the most common type of arthritis in children. Learn about juvenile rheumatoid arthritis symptoms, diagnosis, and treatment.

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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