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

What causes knee stiff? 10 possible conditions

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

1

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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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

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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4

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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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

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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7

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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8

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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9

Juvenile Rheumatoid Arthritis

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

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10

Infectious (Septic) Arthritis

Infectious arthritis occurs when an infection, caused by a bacteria or virus, spreads to a joint or the fluid surrounding the joint (synovial fluid).

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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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