Tennis elbow, also known as lateral epicondylitis, is a condition that can result from overuse of the muscles and tendons in the elbow. Tennis elbow is often linked to repeated motions of the wrist and arm.

Despite its name, most people who get tennis elbow don't play tennis. Some people have jobs that involve repeated movements that can lead to tennis elbow. These include plumbers, painters, carpenters and butchers. However, often tennis elbow has no clear cause.

The pain of tennis elbow occurs mainly where the tough, cord-like tissues of the forearm muscles attach to a bony bump on the outside of the elbow. The tissues are known as tendons. Pain can spread into the forearm and wrist.

Rest, pain medicines and physical therapy often help relieve tennis elbow. People for whom these treatments don't help or who have symptoms that get in the way of daily living might have a procedure, such as a shot or surgery.

Symptoms

The pain of tennis elbow can travel from the outside of the elbow into the forearm and wrist. Pain and weakness can make it hard to:

• Shake hands or grip an object.
• Turn a doorknob.
• Hold a coffee cup.

Causes

Tennis elbow is often linked to overuse and muscle strain. But the cause is not well understood. Sometimes, repeated tensing of the forearm muscles that are used to straighten and raise the hand and wrist triggers the symptoms. This can cause a breakdown of the fibers in the tendon that attaches the forearm muscles to the bony bump at the outside of the elbow.

Activities that can cause tennis elbow symptoms include:

• Playing racket sports, especially using backhand, with poor form.
• Using plumbing tools.
• Painting.
• Driving screws.
• Cutting up foods for cooking, particularly meat.
• Using a computer mouse a lot.

Less often, an injury or a condition that affects the body's connective tissues causes tennis elbow. Often, the cause isn't known.
https://www.mayoclinic.org/diseases-conditions/tennis-elbow/symptoms-causes/syc-20351987

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