If you have been told you have RSI, you are not alone. Repetitive strain injury is one of the most frequently given explanations for arm, wrist and hand pain — particularly in people who use computers, perform manual work or play a sport or instrument regularly. It is also one of the most misunderstood. The problem is not that RSI is a wrong diagnosis. The problem is that it is not really a diagnosis at all.
What RSI actually means
RSI stands for repetitive strain injury. The term describes a mechanism — that repeated or sustained movement has caused an injury, but it says nothing about what structure has been injured or how. Think of it like being told you have a “running injury.” It explains how you got hurt but not what is actually wrong.
In clinical practice, RSI is used as a catch-all term for a wide range of distinct conditions affecting the tendons, nerves, muscles and joints of the upper limb. Each of these conditions is different. Each affects a different structure and each requires a different treatment.
Treating RSI as a single condition — with rest, anti-inflammatories and generic exercises — is one of the main reasons people with upper limb pain struggle to recover.
The conditions behind the label
Some of the most common conditions grouped under RSI include:
Tendinopathy — irritation of a specific tendon caused by overuse. The treatment depends entirely on which tendon is affected and what stage of the condition you are at.
deQuervain’s tenosynovitis — inflammation of the tendons on the thumb side of the wrist. Causes pain with gripping, pinching and thumb movement. Often referred to as Mummy’s Thumb or Gamer’s Thumb.
Lateral epicondylitis (tennis elbow) — overuse of the forearm extensor tendons causing pain on the outer elbow. Extremely common in people who use computers, grip tools or play racquet sports.
Medial epicondylitis (golfer’s elbow) — overuse of the forearm flexor tendons causing pain on the inner elbow. Frequently occurs alongside other conditions and can be confused with referred nerve pain.
Carpal tunnel syndrome — compression of the median nerve at the wrist. Causes tingling, numbness and pain in the thumb, index and middle fingers. Symptoms are often worse at night.
Cubital tunnel syndrome — compression of the ulnar nerve at the elbow. Causes tingling and numbness in the ring and little fingers, sometimes with weakness in the hand.
Thoracic outlet syndrome — compression of nerves or blood vessels in the space between the collarbone and first rib. Produces symptoms in the arm, hand and fingers. Often confused with more common nerve entrapment conditions.
Intersection syndrome — friction between two groups of tendons in the forearm, producing pain and swelling above the wrist. Often confused with deQuervain’s, but requiring different management.
Work-related upper limb disorders — a broad category covering conditions caused or aggravated by occupational tasks. Accurate identification of the structures involved is essential for workplace advice and effective treatment.
This is not an exhaustive list. There are many other conditions that can be labelled RSI, and in some patients more than one condition is present at the same time.
Why getting the right diagnosis matters
If you have been told you have RSI and advised to rest, you may have found that rest helps in the short term. However, symptoms return when you go back to normal activity. This is very common.
The reason is that rest does not treat the underlying condition. Some conditions require specific loading and progressive exercise to recover. Others need splinting to rest a particular structure while keeping the rest of the hand and arm mobile. Nerve conditions require treatment directed at the nerve itself. Without knowing what is actually wrong, treatment is largely guesswork.
The same applies to generic exercise programmes. An exercise that helps one tendinopathy may aggravate another. An exercise that helps carpal tunnel syndrome may worsen another soft tissue problem. Specificity matters.
Could it be coming from somewhere else?
One of the most important — and most commonly missed — aspects of upper limb assessment is recognising when symptoms in the arm, wrist or hand are actually coming from somewhere else.
Neck problems, thoracic outlet syndrome and double crush nerve phenomena can all produce symptoms that are felt primarily in the hand or wrist, but originate elsewhere. A thorough assessment covers the neck, full upper limb to the fingertips - not just the area where the pain is felt.
What to do if you have been diagnosed with RSI
If you have been given an RSI diagnosis and are not making progress, the most useful step is a specialist assessment. A Certified Hand Therapist (CHT) has the clinical expertise to identify the specific condition or conditions causing your symptoms and design a targeted treatment programme.
You can seek specialist input directly, without going through your GP first, and appointments are often available within the same week.
The goal of a proper assessment is not to replace the RSI label with a more complicated one. It is to give you a clear, specific answer about what is wrong and a treatment plan that is actually designed to fix it.
If you have persistent upper limb pain that has been attributed to RSI without a more specific explanation, Ms Razo provides specialist assessment and diagnosis from her clinic in Belfast and via video appointment. No GP referral is required.