It is a type of tendinitis (swelling of the tendon) and is also called lateral epicondylitis.

It causes pain outside elbow and sometimes in the forearm and wrist too.

Causes:

- Excessive use of muscles of the back of forearm

- Overexertion

- Trauma such as direct blows to the epicondyle

- Sports like racquet sports such as squash or tennis

- Cutting up and Cooking

- Painting, carpentry, playing musical instruments, etc. increases the pain

- Repetitive use of computer mouse 

Risk Factors:

- Tennis elbow is common in adults aged between of 30 to 50.

- Playing racket sports increases risk of tennis elbow.

- Occupation where repetitive movement of wrist elbow and arm is done develop tennis elbow risk like dentist etc.

Symptoms:

Pain or feeling weakness on holding a coffee mug, turning a doorknob, shaking hands or griping an object. Pain on straightening of wrist.

Treatment:

- Treatment includes rest, pain relievers and physiotherapy.

- Icing the elbow to reduce pain and swelling. 

- Using an elbow strap to protect the injured tendon from further strain.

- Taking non steroidal anti-inflammatory (NSAIDs), such as ibuprofen, naproxen, or aspirin, to help with pain and swelling.

- Performing range of motion exercises to reduce stiffness and increase flexibility.