Tennis elbow is an injury caused by the repeated strain of gripping or twisting your hand or wrist.
Symptoms include pain and tenderness, usually on the outer side of your elbow, caused by the tendons from your forearm muscle becoming inflamed. You may experience pain on gripping small objects (for example, when writing), and when lifting, bending or twisting the arm. While painful, there are no long-term effects.
Treatment does improve symptoms, and includes rest and support, medication and physiotherapy. Surgery is uncommon, but is an option if the condition persists.