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Epicondylitis is a term used to describe inflammation or irritation of the epicondyle, which are bony prominences at the end of the humerus bone in the elbow. More commonly, it refers to conditions affecting the tendons that attach to these epicondyles. The two main types are lateral epicondylitis and medial epicondylitis.

Lateral epicondylitis, often called tennis elbow, affects the outer bony prominence of the elbow. It is typically caused by overuse and repetitive motions involving the wrist extensors, such as gripping or lifting. Symptoms include pain and tenderness on the outside of the elbow, which may radiate down the forearm. Weakness in the hand and forearm can also occur.

Medial epicondylitis, known as golfer's elbow, affects the inner bony prominence of the elbow. This condition is usually related to overuse of the wrist flexors and pronators, common in activities like golf, baseball pitching, or certain manual labor tasks. Pain and tenderness are felt on the inside of the elbow and can sometimes radiate into the forearm and wrist.

Diagnosis of epicondylitis is usually based on a physical examination and a review of the patient's medical history and activities. Imaging tests like X-rays or MRIs are not always necessary but may be used to rule out other conditions. Treatment typically involves rest, ice, pain relief medication, and physical therapy to strengthen and stretch the affected muscles. In some cases, corticosteroid injections or surgery may be considered.