Pain at the Base of Your Thumb: Common Causes
By Mr Gavin Schaller FRCS(Tr&Orth) | Consultant Hand & Wrist Surgeon | Reviewed August 2026
In short: Pain at the base of the thumb is most often caused by arthritis of the carpometacarpal (CMC) joint, the joint where the thumb meets the wrist. It typically causes an ache when gripping, pinching or turning a key, and a tender, sometimes swollen joint. Other causes include de Quervain's tenosynovitis, which affects the thumb-side tendons, and less commonly a ganglion or an old injury. Most thumb-base pain is managed without surgery, with activity changes, a splint and sometimes an injection.
What causes pain at the base of the thumb?
Pain at the base of the thumb is most commonly caused by osteoarthritis of the carpometacarpal joint, though tendon problems and injuries can produce similar pain. The carpometacarpal (CMC) joint is the joint at the base of the thumb, where the thumb column meets a small bone in the wrist, and it is one of the most frequent sites of arthritis in the hand.
The reason this joint wears is the work it does. The CMC joint allows the thumb to swing across the palm and to pinch, and this wide range of movement places it under high load with everyday tasks. Over years the cartilage can thin, producing the ache, tenderness and weakness that bring people to clinic. Working out whether the pain comes from the joint or from a nearby tendon is the first step towards the right treatment.
Is thumb base pain a sign of arthritis?
Pain at the base of the thumb that is worse with gripping and pinching, and that comes with tenderness over the joint, is often a sign of CMC joint arthritis. Thumb-base arthritis is common from middle age onwards and affects women more often than men. Typical features include:
an ache at the base of the thumb when gripping, pinching or turning a key or jar lid,
tenderness and sometimes swelling right at the joint where the thumb meets the wrist,
weakness of pinch and grip,
a grinding or creaking sensation when the thumb is moved,
in longer-standing cases, a squared-off appearance at the thumb base.
The NHS notes that hand osteoarthritis, including the thumb base, is common, particularly around and after the menopause. Symptoms often build gradually over months to years rather than appearing suddenly.
What else causes pain on the thumb side of the wrist?
Not all thumb-base pain is arthritis. Tendon inflammation, cysts and old injuries can cause similar symptoms amongst other conditions. The pattern and exact location of the pain help tell them apart. Common alternatives include:
De Quervain's tenosynovitis, inflammation of the tendons on the thumb side of the wrist, which causes pain a little further back towards the wrist and is often triggered by lifting a baby or repetitive gripping. Our article on de Quervain's tenosynovitis explains how it differs.
A ganglion cyst, a fluid-filled swelling arising from a joint or tendon that can cause a tender lump near the thumb base.
An old fracture or injury, which can leave a joint painful or lead to earlier wear.
Inflammatory arthritis, such as rheumatoid or psoriatic arthritis, which can involve the thumb alongside other joints.
De Quervain's and thumb-base arthritis can also coexist, which is one reason a hand examination is more reliable than trying to distinguish them from symptoms alone.
When should I see a hand surgeon about thumb pain?
You should see a hand specialist about thumb-base pain when it persists for more than a few weeks, interferes with everyday tasks or is not settling with simple measures. Most thumb-base pain is not urgent, but an assessment is worthwhile if you notice any of the following:
pain that limits gripping, pinching or work despite rest and simple painkillers,
increasing weakness or difficulty with tasks such as jars, keys and buttons,
a joint that is becoming stiff, swollen or deformed,
a painful lump at the thumb base,
thumb-side pain alongside numbness or tingling, which may point to a nerve problem as well.
A hand surgeon can examine the joint and tendons, arrange an X-ray if arthritis is suspected, and confirm the cause. Most people are then managed without surgery, and knowing the diagnosis makes the treatment far more straightforward.
How is pain at the base of the thumb treated?
Treatment for thumb-base pain depends on the cause, and for CMC joint arthritis it begins with simple non-surgical measures. Most people never need surgery. The usual first steps are:
Activity adjustment. Modifying or spacing out the tasks that load the thumb, and using gadgets such as jar openers and larger grips, reduces strain on the joint.
A thumb splint.A thumb splint that supports the base of the thumb can ease pain, particularly during aggravating activities or at night.
Pain relief. Simple painkillers or an anti-inflammatory gel, used as advised, help manage flares.
Hand therapy. A hand therapist can provide a splint, exercises and joint-protection advice.
A corticosteroid injection. A targeted injection into the joint can settle a painful flare for a period.
When thumb-base arthritis remains painful despite these measures, thumb arthritis surgery is a reliable option that relieves pain and restores function. Surgery is considered only after non-surgical treatment has been given a fair trial.
My approach to thumb-base pain
In my clinic the first task with thumb-base pain is simply to confirm where it is coming from, because arthritis of the CMC joint and de Quervain's tenosynovitis are both common, sit close together and are treated differently. A careful examination, usually with an X-ray when arthritis is suspected, settles the question quickly.
Where the diagnosis is thumb-base arthritis, I am clear with patients that the great majority are managed comfortably without surgery, with activity changes, a splint and the occasional injection. I only discuss an operation when the joint stays painful despite those measures and the pain is limiting daily life. The aim is to keep the thumb working with the least intervention that controls the symptoms.
From October 2026 I consult at London Sports Orthopaedics, 31 Old Broad Street and operate at London Bridge Hospital, as well as Spire Bushey and Pinehill Hospital in Hertfordshire. If thumb-base pain is affecting your daily life, you are welcome to book a consultation.
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Frequently asked questions about pain at the base of the thumb
Why does the base of my thumb hurt when I grip? Pain at the base of the thumb when gripping or pinching is most often caused by arthritis of the carpometacarpal (CMC) joint. This joint takes high loads during pinch and grip, so worn cartilage there tends to hurt precisely with those actions. Tendon problems such as de Quervain's can cause similar pain a little further back towards the wrist, so an examination helps confirm the cause.
How do I know if my thumb pain is arthritis or de Quervain's? Thumb-base arthritis usually causes pain right at the joint where the thumb meets the wrist, worse with pinching and turning keys or jars. De Quervain's tenosynovitis causes pain slightly further back along the thumb side of the wrist, often triggered by lifting or repetitive gripping. The two can coexist, so a hand examination — and sometimes an X-ray — is the reliable way to tell them apart.
Is thumb base pain serious? Thumb-base pain is rarely serious in the sense of being dangerous, but it can significantly affect hand function and quality of life. Most cases are due to arthritis and are managed without surgery. Pain that is worsening, causing weakness or deformity or accompanied by numbness deserves assessment, as does a painful lump, so that the cause is confirmed and treated appropriately.
Can thumb arthritis be treated without surgery? Yes. Most thumb-base arthritis is managed without surgery. Activity changes, a supportive thumb splint, simple pain relief, hand therapy and occasional corticosteroid injections keep the great majority of people comfortable. Surgery is reserved for joints that remain painful and limiting despite these measures, and many people never reach that point.
What kind of splint helps thumb base pain? A splint that supports the base of the thumb, sometimes called a CMC or thumb spica splint, is the type used for thumb-base arthritis. It rests the joint and limits the movements that aggravate it, which can ease pain during tasks or overnight. A hand therapist can fit one to your hand, and it is often one of the most effective simple measures.
Will thumb base pain go away on its own? Thumb-base pain from a minor strain may settle with rest, but pain from CMC joint arthritis tends to persist or gradually progress, because the underlying joint wear does not reverse. Symptoms often fluctuate, with better and worse spells. Simple measures usually keep it manageable, but pain that is steadily worsening or limiting daily tasks is worth having assessed.
Which doctor treats pain at the base of the thumb? Pain at the base of the thumb can be assessed by a GP first, and by a hand surgeon or hand therapist for further management. A hand surgeon can confirm whether the cause is arthritis, a tendon problem or something else, arrange any imaging needed and guide treatment. Inflammatory arthritis affecting several joints is managed alongside a rheumatologist.
Mr Gavin Schaller FRCS(Tr&Orth), Consultant Hand & Wrist Surgeon The Schaller Hand & Wrist Clinic About Mr Schaller
This article is for general information only and is not a substitute for a consultation with a qualified clinician. If you have concerns about your hand or wrist, please seek medical advice.
