Tennis elbow and tendinopathy explained

What tennis elbow really is

Tennis elbow, medically called lateral epicondylitis, is pain where the tendons of the forearm muscles attach to the bony bump on the outside of the elbow. These muscles pull the wrist and fingers back, so the tendon is loaded every time you grip, lift, type or turn a doorknob. The pain is felt on the outer elbow and often spreads down the forearm, and gripping — even holding a kettle or shaking hands — can be sharply painful. Despite the old "-itis" name suggesting simple inflammation, the tendon is actually showing wear-and-repair changes from repeated overload rather than active inflammation, which is why anti-inflammatory approaches alone often disappoint.

How tendons get injured

Tendons are strong but slow to adapt. When the load on a tendon repeatedly exceeds what it can cope with — through repetitive gripping, a sudden increase in activity, or unaccustomed tasks like a weekend of DIY — tiny areas of the tendon fail to repair properly. Over time the tendon's structure becomes disorganised and less able to handle load, and it becomes painful. This is tendinopathy. The same process affects tendons elsewhere: the Achilles at the heel, the patellar tendon below the kneecap, and the shoulder. Because the problem is one of overload and failed repair rather than a one-off tear, recovery depends on gradually rebuilding the tendon's tolerance, not just resting it.

Why rest alone is not the answer

It is tempting to simply stop using the arm, and cutting back on the activities that flare the pain does help in the short term. But complete rest weakens the tendon and the muscles around it, so pain often returns as soon as normal activity resumes. Modern management centres on controlled loading: carefully graded strengthening exercises that gently and progressively stress the tendon so it rebuilds its capacity. These exercises may cause mild, tolerable discomfort, which is expected. Done consistently over weeks to months, they are the most effective treatment for tennis elbow and most tendinopathies. A physiotherapist can tailor the programme and adjust it as the tendon improves.

What else can help

Alongside loading exercises, several measures ease symptoms while the tendon recovers. Simple pain relief and adjusting how you do provoking tasks — for example, lifting with the palm up or using a lighter grip — reduce daily flare-ups. A forearm strap or brace can offload the tendon for some people. Steroid injections may give short-term pain relief but do not improve long-term recovery and can even slow it, so they are used cautiously. Tennis elbow is usually self-limiting and settles within a year or so for most people, though it can be persistent. Newer injection treatments exist but the evidence is mixed, and exercise remains the foundation of care.

Recovery and when to seek help

Recovering from a tendinopathy takes patience — meaningful improvement is usually measured in weeks to months, not days, and setbacks are common if activity ramps up too fast. Sticking with the exercise programme, pacing activity, and gradually returning to full use give the best results. See your GP or a physiotherapist if elbow or tendon pain is persistent, limiting your work or daily tasks, or not settling with self-care, so the diagnosis can be confirmed and a plan started. Seek prompt advice if pain follows a sudden injury with a snap or a sudden loss of strength, if the area is hot, red and swollen, or if you feel generally unwell, as these suggest a different problem.