Pain along the side of your palm usually traces back to the dense web of nerves, tendons, small bones, and blood vessels packed into that narrow strip between your wrist and your little finger. The area most people mean when they say “the side of my palm” is the ulnar border, the fleshy pad beneath your pinky known as the hypothenar eminence. Because the ulnar nerve, ulnar artery, several small wrist bones, and a cartilage complex all crowd together there, a surprising number of conditions can produce pain in the same spot, and telling them apart matters because the treatments are quite different.
What Is Actually in That Part of Your Hand
The hypothenar eminence sits on the pinky side of your palm and contains three small muscles that help your little finger move and cup your hand. Running through and beside those muscles is the ulnar nerve, which enters the hand through a tight passageway called Guyon’s canal. Anatomical dissections have identified multiple branching patterns the nerve can take once it enters the canal, which partly explains why people experience different combinations of pain, numbness, and weakness depending on exactly where pressure or injury occurs.1The Journal of Hand Surgery. Anatomic study of the ulnar nerve and related vascular anatomy at Guyon’s canal: A practical classification system The ulnar artery runs alongside the nerve, and just beneath the skin sit the pisiform and the hook of the hamate, two small bones that form part of the canal’s walls. Any one of these structures can become the source of your pain.
Ulnar Nerve Entrapment at Guyon’s Canal
One of the most common reasons the side of your palm aches is compression of the ulnar nerve as it passes through Guyon’s canal. This condition, sometimes called Guyon’s canal syndrome, produces pain, tingling, or numbness along the ulnar border of the hand and into the ring and little fingers.2PubMed. Ulnar nerve entrapment in Guyon’s canal due to recurrent carpal tunnel syndrome: case report Depending on which branch of the nerve gets squeezed, you might feel only sensory symptoms like burning or prickling, only motor symptoms like hand weakness and clumsiness, or both at once.
Causes of the compression vary. Ganglion cysts, lipomas, and other benign growths within the canal can press on the nerve. Repetitive pressure from leaning on the heel of your hand at a desk, using vibrating tools, or gripping handlebars during long bike rides can do it too. In rare cases, unusual anatomical variants of the hypothenar muscles themselves thicken with overuse and squeeze the nerve from the outside.3PubMed. Variation in the hypothenar muscles and its impact on ulnar tunnel syndrome Even a fall onto an outstretched hand can trigger swelling inside the canal that pinches the nerve.4PubMed. Intraneural microcystic lymphatic malformation of the ulnar nerve at the Guyon canal: Unusual cause of ulnar pain in a child
Surgical decompression of the nerve is an option when conservative measures fail. A study evaluating outcomes after surgery found that roughly two-thirds of patients had a good functional result, while the remaining third continued to have lingering numbness or weakness. Patients who waited longer than three months before surgery or who had diabetes were more likely to have a poor outcome.5PubMed Central. Influential factors of surgical decompression for ulnar nerve neuropathy in Guyon’s canal That finding underlines why early evaluation matters if the pain keeps coming back or if you notice your grip getting weaker.
Cyclist’s Palsy and Repetitive Pressure Injuries
If you ride a bicycle, play racquet sports, or do manual labor that involves gripping, you are at higher risk for ulnar-side palm pain caused by sustained or repeated pressure. “Handlebar palsy” is the classic example: during a long ride, your body weight bears down through your palms onto the handlebars, compressing the deep branch of the ulnar nerve right at the hypothenar pad.6PubMed Central. Median and ulnar nerve injuries in cyclists: A narrative review Symptoms can show up during the ride or appear several days afterward, which catches many people off guard.
In some cases the damage targets only the deep motor branch, sparing sensation entirely. That means you might not feel any tingling at all but notice that your hand muscles are weak, particularly when trying to spread your fingers apart or pinch firmly. Case reports describe severe weakness of the intrinsic hand muscles after a single long ride, caused entirely by external pressure rather than a structural problem inside the canal.7PubMed. Handlebar palsy–a compression syndrome of the deep terminal (motor) branch of the ulnar nerve in biking Padded gloves, shifting hand positions frequently, and adjusting handlebar height are the usual preventive steps. Most cases resolve on their own once the repetitive pressure stops, though recovery can take weeks.
Hypothenar Hammer Syndrome
This one is less well known but worth understanding, especially if you use the heel of your hand as a tool. Hypothenar hammer syndrome is a vascular condition caused by damage to the ulnar artery right where it passes over the hook of the hamate bone. People who repeatedly strike objects with the base of the palm, whether pounding a hammer, pressing down on a stapler hundreds of times a day, or using the hand to bang parts into place, can injure the artery wall.8PubMed Central. Hypothenar hammer syndrome: case reports and brief review
The injured artery can develop a blood clot or a small aneurysm, both of which reduce blood flow to the fingers on that side. Symptoms include pain at the hypothenar pad, coldness or color changes in the ring and little fingers, and sometimes tiny painful spots on the fingertips where blood supply is compromised. Because the pain location overlaps with nerve entrapment, hypothenar hammer syndrome often gets misdiagnosed. If your palm pain comes with pale or blue-tinged fingers on the pinky side, vascular damage is worth investigating.
Fractures of the Hook of the Hamate
The hamate is a small wrist bone that sits right beneath the hypothenar eminence, and it has a hook-shaped projection that sticks up into the base of the palm. That hook is vulnerable to fracture, particularly in sports involving a bat, club, or racquet. A forceful grip that jams the handle into the heel of the palm can snap the hook off. The pain typically shows up as a deep, poorly localized ache on the ulnar side of the palm, and squeezing or gripping makes it worse.
Hook of the hamate fractures are frequently missed on standard X-rays, which is why clinicians sometimes describe them as one of the more commonly overlooked injuries in this area.9PubMed Central. Hook of the Hamate: The Spectrum of Often Missed Pathologic Findings A CT scan is much more reliable for picking them up. Left untreated, a nonunion fracture can chronically irritate the nearby ulnar nerve or flexor tendons, creating a secondary problem on top of the original break. Treatment ranges from casting and activity modification for fresh fractures to surgical removal of the broken hook fragment when healing fails.
TFCC Injuries
The triangular fibrocartilage complex, usually abbreviated TFCC, is a pad of cartilage and ligaments on the ulnar side of the wrist that acts as a cushion and stabilizer. Both sudden trauma, like catching yourself during a fall, and gradual wear and tear can damage it. The resulting pain tends to settle on the ulnar side of the wrist and can extend into the palm, especially during twisting motions like turning a doorknob or wringing out a cloth.10PubMed Central. TFCC injuries: How we treat?
TFCC tears are often described as producing “vague ulnar-sided wrist pain,” which is part of the diagnostic challenge. Many people assume they have a sprain that will get better on its own, and it sometimes does. But a full tear or a tear combined with wrist instability can persist for months and may need arthroscopic repair. If your pain flares specifically when you rotate your forearm or push off the heel of your hand, the TFCC should be on the shortlist.
Pisotriquetral Joint Arthritis
The pisiform is a small, pea-shaped bone that you can feel at the base of the hypothenar pad, right where your wrist meets your palm. It sits on top of the triquetrum bone and forms the pisotriquetral joint. Osteoarthritis of this joint has a surprisingly high prevalence in older adults, yet it frequently goes undiagnosed.11PubMed Central. The pisotriquetral joint: osteoarthritis and enthesopathy The pain feels like a deep ache right at the base of the hypothenar eminence and tends to worsen with gripping or twisting movements.12Journal of Orthopaedic Reports. Pisotriquetral joint osteoarthritis and instability: A narrative review of anatomy, diagnosis, and management
One reason it gets missed is that standard wrist X-rays may not show the joint clearly unless a specific angled view is requested. If pressing directly on the pisiform reproduces your pain and grinding it side to side makes it worse, the joint itself is likely involved. Treatment usually starts with splinting, anti-inflammatory medication, and cortisone injections. In stubborn cases, surgical removal of the pisiform relieves the pain without significantly affecting hand function, because the bone’s role is mostly to improve the leverage of a wrist flexor tendon rather than to bear major loads.
Dupuytren’s Disease
Dupuytren’s disease causes thickening and tightening of the fibrous tissue beneath the skin of the palm. It usually starts as a small, firm nodule and can progress over years into cords that pull the fingers into a bent position. The condition is generally considered painless, but that reputation is not entirely accurate. A study of early-stage patients who did experience pain found nerve tissue caught up in the fibromatosis in every case examined during surgery, suggesting that nerve compression within the nodules can cause real discomfort.13The Journal of Hand Surgery. Painful Nodules and Cords in Dupuytren Disease
The disease typically affects the ring and little finger rays, which means the nodules often sit right along the ulnar side of the palm. Early on, a painful lump in the palm that is firm and does not move much with the skin is a characteristic sign. Dupuytren’s is more common in men, in people of Northern European descent, and in those with diabetes or a history of heavy alcohol use. If you feel a hard nodule at the base of your ring or little finger and the overlying skin seems puckered, it is worth mentioning to your doctor even if the finger still straightens fully.14PubMed Central. The Rationale for Treating the Nodule in Dupuytren’s Disease
Referred Pain from the Neck
Sometimes the side of your palm hurts because of a problem nowhere near your hand. The ulnar nerve originates from nerve roots in the lower neck, and compression or irritation along its entire path, from the cervical spine through the elbow and down to the wrist, can produce symptoms that feel like they are coming from the palm. Cervical radiculopathy, where a nerve root in the neck is pinched by a herniated disc or bone spur, can send pain, numbness, or tingling all the way into the hand. Compression of the brachial plexus, the network of nerves that branches out from the neck toward the arm, can do the same.15PubMed Central. A clinical review of hand manifestations of cervical myelopathy, cervical radiculopathy, radial, ulnar, and median nerve neuropathies
The clue that your palm pain might be referred from the neck is the presence of other symptoms you would not expect from a purely local hand problem: neck stiffness, shoulder pain, arm weakness, or symptoms that change when you move your head. If your hand exam and imaging look normal but the pain persists, a clinician may turn attention to the cervical spine. This is one of the reasons a thorough evaluation matters rather than assuming the problem must be where you feel it.
Inflammatory and Systemic Conditions
Rheumatoid arthritis, psoriatic arthritis, and gout can all produce pain on the ulnar side of the hand, though they usually affect the wrist joint and the knuckles more than the hypothenar pad itself. Ultrasound studies of rheumatoid arthritis patients found that the most common abnormality was inflammation of the wrist joint lining, present in about three-quarters of patients, followed by inflammation at the knuckle joints in just under half.16PubMed Central. High Frequency Ultrasonography of the Hand in Rheumatoid Arthritis, Psoriatic Arthritis, Gout and Osteoarthritis Patients Gout patients showed a similar pattern, with wrist inflammation being the most frequent finding.
If the pain on the side of your palm is accompanied by morning stiffness lasting more than half an hour, swelling at the wrist or knuckles, or episodes of sudden intense pain with redness, an inflammatory condition is worth considering. Blood tests for inflammatory markers and uric acid, along with imaging, can help sort this out. These conditions are systemic, so treatment goes well beyond the hand and typically involves disease-modifying medications rather than local measures alone.
How the Pain Gets Diagnosed
Because so many different structures overlap in a small area, a careful physical exam is the first and most important step. The standard clinical sequence for hand evaluation follows a pattern of looking, touching, and moving: inspecting for swelling or deformity, pressing on specific landmarks to identify the tender spot, testing range of motion, and running special provocative tests designed to stress individual structures. The location and character of the tenderness, combined with what triggers it, usually narrows the list quickly.
Imaging comes next when the exam is not conclusive. Standard X-rays are useful for fractures and arthritis but can miss soft-tissue problems and even some fractures, like the hook of the hamate. MRI provides excellent detail for soft tissues, including the TFCC, nerve abnormalities, and tumors, though it is expensive and not always immediately available. Ultrasound has been gaining ground as a faster, cheaper alternative that can visualize tendons, nerves, and blood vessels in real time.17PubMed Central. Sonographic Assessment of Hand Injuries: Diagnostic Accuracy and Review of Pathology Nerve conduction studies are often ordered when ulnar nerve entrapment is suspected, both to confirm the diagnosis and to pinpoint where along the nerve the compression is happening.
When to Seek Urgent Care
Most causes of ulnar-side palm pain are not emergencies, but a few situations call for prompt attention. Sudden, severe pain with swelling and firmness of the palm, especially if accompanied by pale skin, coldness, or loss of feeling in the fingers, raises concern for compartment syndrome, a rare condition where pressure builds up within a closed tissue space and threatens blood supply.18The American Journal of Emergency Medicine. Acute hand pain resulting in spontaneous thenar compartment syndrome This is a surgical emergency. Similarly, an open wound on the palm with spreading redness and fever suggests a deep-space infection that needs urgent treatment.
Less dramatically, progressive weakness in your grip or in the ability to spread your fingers apart deserves a prompt visit rather than a wait-and-see approach. Prolonged nerve compression can cause muscle wasting in the hand that becomes difficult to reverse. If you have been managing palm pain conservatively for a few weeks and it is getting worse rather than better, or if numbness is spreading, get it evaluated sooner rather than later.
Why the Human Hand Is So Vulnerable There
It is not a coincidence that so many problems cluster along the ulnar border of the palm. The human hand evolved for a distinctive combination of powerful gripping and fine manipulation, a repertoire of movements that places unique demands on the structures along the palm’s edge.19Cambridge University Press. Evolution of the human hand: approaches to acquiring, analysing and interpreting the anatomical evidence When you grip a hammer, swing a bat, or even just lean on the heel of your hand, the hypothenar eminence absorbs a disproportionate share of the force. The ulnar nerve, artery, and small bones sit millimeters from the surface with relatively little padding. In a hand built for power gripping, the tradeoff is that the very structures enabling that grip are exposed to the mechanical stresses that come with it. Modern life adds its own insults: keyboards, bike handlebars, power tools, and smartphones all load the palm in ways our anatomy tolerates but does not welcome over thousands of repetitions.