Tennis elbow is the most common cause of pain on the outer side of the elbow, and despite the name, most people who get it have never picked up a racquet. It comes on with gripping, lifting and everyday tasks, and while it can be slow to settle, the great majority of cases recover with the right approach. Here is what it is, why it happens, and what actually helps.
What tennis elbow is
Tennis elbow, known clinically as lateral epicondylalgia, is an overload problem of the tendon that attaches the wrist extensor muscles to the bony bump on the outside of the elbow. The tendon most involved is the extensor carpi radialis brevis, where it attaches about one to two centimetres below that bony point. The older name for the condition ends in "itis", which implies inflammation, but the tissue change is degenerative rather than inflammatory, the same kind of failed-healing process seen in other tendon problems. This is why anti-inflammatory approaches alone often fall short, and why rebuilding the tendon's capacity to handle load is what makes the difference.
It affects an estimated one to three percent of people, most often between the ages of 40 and 50, and it turns up in men and women at similar rates. Only about 5 to 10 percent of people who get it actually play tennis. Far more cases come from work and daily tasks that load the wrist and forearm repeatedly.
What it feels like
The typical pattern is pain over the outer elbow that can spread down the forearm, brought on by gripping, lifting, shaking hands, turning a key or a doorknob, or carrying things with the palm facing down. Many people notice their grip has weakened, or a burning feeling near the outside of the elbow. The tender spot is usually very focal, just below the bony point on the outside of the elbow.
Why it happens
Tennis elbow develops from repeated loading of the wrist extensor muscles, rather than from a single injury. Common contributors include:
- Forceful, repetitive gripping and heavy lifting, which is why manual trades and assembly work feature heavily
- Long hours of computer and mouse use
- Repeated twisting of the forearm, and exposure to vibrating tools
- Racquet sports, throwing sports and swimming, particularly where technique places extra strain on the forearm
- Coexisting neck and shoulder problems, which make recovery slower
How it is diagnosed
The diagnosis is clinical, made from the story and a focused examination rather than from a scan. The hallmark is focal tenderness at the tendon's origin combined with pain reproduced when the wrist is extended against resistance, when the middle finger is extended against resistance, and on gripping, usually tested with the elbow straight to load the tendon. Grip strength is often reduced by the pain. Imaging is not usually needed, though an ultrasound can show the tendon changes and is useful when the diagnosis is uncertain or the symptoms are not settling as expected.
What else elbow pain can be
Most pain on the outer elbow is tennis elbow, but a few patterns point elsewhere and need a different approach. The most important mimic is radial tunnel syndrome, where a nerve in the forearm is irritated, the tender spot sits lower down the forearm and the pain is worse on twisting the forearm outward against resistance. Pain referred from the neck, particularly the lower neck, can also show up at the outer elbow, which is why the neck and shoulder are checked as part of a thorough assessment. Less commonly, wear in the elbow joint itself, a soft-tissue fold inside the joint, or a sense of instability can be responsible. This is why an accurate diagnosis comes first, rather than treating every outer-elbow pain as a tendon problem.
How tennis elbow is treated
The encouraging news is that most cases settle without injections or surgery, with conservative care succeeding around 90 percent of the time. The foundation is not rest, it is the right kind of loading, supported by sensible changes to how you use the arm while the tendon recovers.
Load management and bracing
The first step is to ease off the loads that flare it without stopping using the arm altogether, then build back gradually. Adjusting how you work, your desk and mouse setup, your grip and your technique takes strain off the tendon. A counterforce brace, worn just below the elbow, can reduce the pull on the tendon during aggravating tasks and help you stay active while you recover.
Strengthening the wrist extensors
The treatment with the best evidence for lasting improvement is a progressive loading programme for the wrist extensors, using slow, controlled exercises that build the tendon's tolerance over time. This is the work that changes the course of the problem and reduces the chance of it returning, and it is usually the part people skip. Hands-on treatment such as soft-tissue work and dry needling can ease symptoms alongside the loading programme, but the loading is what does the lasting work.
Where shockwave therapy fits
When tennis elbow has been present for several months and has not settled with loading and the measures above, shockwave therapy is a well-supported next step. It reduces pain and improves grip strength, and over the medium and long term it outperforms corticosteroid injection, which tends to help in the short term but is linked to worse results and more recurrences later on. Shockwave works by stimulating a stalled healing response, and it is used alongside the exercise programme, not in place of it. You can read more about how shockwave therapy works and the conditions it suits.
Warning signs to watch for
- Pain that travels from the neck or shoulder into the arm, or comes with pins and needles, numbness or weakness in the hand and fingers, which suggests a nerve or neck source rather than the tendon
- Pain that sits lower down the forearm and is worse on twisting the forearm outward against resistance, which can indicate nerve entrapment that mimics tennis elbow and needs different treatment
- A sudden loss of strength, or locking, catching or a sense of instability in the elbow, which points to a joint or structural problem
- An elbow that is hot, red, swollen, or painful with fever, which needs urgent review to exclude infection or an inflammatory cause
- Pain that is constant, present at rest and at night, or that has not changed at all after several months of appropriate treatment, which is a reason to re-examine the diagnosis
What to expect from treatment
The outlook is good. Most cases resolve over six to twelve months with the right treatment. The main frustrations are the timescale, because tendons are slow to adapt, and recurrence if the load that caused it carries on unchanged. Recovery tends to be slower where there are coexisting neck or shoulder problems, high physical demands at work, or a long delay before starting treatment, which is why getting onto the right plan early helps.
Common questions
Do I have to play tennis to get tennis elbow?
No. Only a small share of people with tennis elbow play tennis at all. Most cases come from work and daily tasks that load the wrist and forearm, such as gripping, lifting and long hours at a computer.
Should I rest my arm completely?
No. Complete rest tends to slow recovery. The aim is to ease off the aggravating loads while keeping the arm working sensibly, then build the tendon's capacity back up with progressive exercise.
Are cortisone injections a good idea?
They can ease pain in the short term, but over the longer term they are linked to worse outcomes and higher recurrence than loading-based treatment, so they are used cautiously rather than as a first resort.
Is shockwave therapy worth it for tennis elbow?
For tennis elbow that has not settled after a few months, shockwave is well supported and outperforms cortisone over the medium and long term. It works best combined with a loading programme rather than on its own.
If elbow pain is getting in the way of work or daily tasks, or it is not settling the way you would expect, it is worth having it properly assessed so the right plan can be put in place. Book a visit and we will work out what is driving it and how to settle it.
