Pain at the Base of Your Thumb: What It Usually Means in St. Thomas, U.S. Virgin Islands

Thumb pain gets ignored longer than most complaints, until you notice how often you use it. Every grip, every jar lid, every key, and for new parents, every single lift of the baby.

Two patterns cause most pain at the base of the thumb. One is a tendon problem on the thumb side of the wrist. The other is wear in the joint where the thumb meets the wrist. They feel different, different things set them off, and they are managed differently.

The tendon pattern

This is pain running from the base of the thumb into the thumb side of the wrist and forearm. It is worst lifting something with your thumb pointing up, wringing out a cloth or a swimsuit, or lifting a baby under the arms. Some people can point to a tender, slightly thickened line just above the wrist crease on the thumb side.

It usually follows a period of heavy repetitive thumb and wrist use rather than a single injury. New parents get it often: lifting a baby under the arms puts the thumb and wrist in exactly the position that irritates it, dozens of times a day, with a load that gets heavier every month. Long stretches holding a phone do a milder version.

The tendons that move the thumb run through a snug sheath at the wrist. When the work goes up faster than the tissue adapts, that passage gets irritated and swollen and the gliding stops being smooth. It is a load problem in a tendon sheath, not arthritis, and treating it as arthritis misses the point.

The joint pattern

This one sits lower and deeper. It is an ache right at the base of the thumb where it meets the wrist, and it does not travel up the forearm the way the tendon pattern does.

Pinching provokes it: turning a key, opening a jar, pulling a lid off, holding a pen. There is often stiffness first thing in the morning, and grip strength quietly drops so that things slip. Over years the joint can look squared off compared with the other hand.

This is wear in a joint, not irritation in a tendon sheath. It is more common with age, given how much load a thumb carries.

Numbness and tingling is a separate question

If the thumb and first fingers go numb or tingle, especially at night, that points at a nerve rather than the tendon or the joint, and it is a different investigation. It is covered on carpal tunnel or a neck problem and numbness and tingling in the hands and arms. Pain with grip and pinch is this page. Numbness is those.

What actually changes it

Changing how you apply the load usually matters more than resting completely. Complete rest is rarely practical with a hand, and the pain returns when normal life resumes.

The clearest example is lifting a baby. Scooping a baby up under the arms loads the thumb and wrist hard. Sliding your hands lower, under the ribs and around the trunk, with the wrists kept straight, takes most of that load off the thumb without asking you to lift less. The same idea applies to carrying bags and to opening jars with a whole-hand grip.

A support worn during the tasks that flare it is reasonable for a while. It is meant to unload the thumb during that activity, not to be worn all day, and pharmacies carry suitable ones. The honest caution: grip and pinch tasks keep both patterns irritated, so if nothing about the load changes, neither will the pain.

How we sort it out at Tradewinds

An examination separates these. We check where the tenderness sits, along the tendons or in the joint, take the thumb and wrist through their range, test grip and pinch, and use the specific tests that provoke each. The neck and arm get checked too. Digital x-rays are taken on site when the joint is the question or a fracture is possible.

Dr. Keys is the Chair of the Virgin Islands Board of Chiropractic Examiners, a member of the Virgin Islands Chiropractic Society, and the International Chiropractors Association representative for the U.S. Virgin Islands.

Care is hands-on work through the thumb, wrist and forearm, joint work where the small bones are stiff, soft tissue therapy, and a plan for changing how the hand is loaded. If this started after a baby arrived, our postpartum recovery page covers the rest of what tends to hurt at the same time.

When thumb or wrist pain needs urgent care

Go to the nearest emergency room, or call 911, if the hand is cold or pale.

See a physician today, not eventually, for:

• A thumb or wrist that is hot, red, swollen and painful, especially with a fever. That can mean an infection, which is urgent.
• Thumb pain after a fall, particularly with tenderness in the small hollow at the base of the thumb when the thumb is stretched out. That raises the question of a scaphoid fracture. It needs imaging, and a normal x-ray early on does not settle it.
• Being unable to move the thumb.
• Numbness or weakness in the hand that is spreading.

Getting seen

Tradewinds Chiropractic & Wellness is in the VI Medical Foundation Building, Suite 202, 9150 Estate Thomas, St. Thomas, USVI 00802. Hours are Mon, Wed, Thu: 10:00 am to 1:00 pm and 3:00 pm to 7:00 pm. Tue, Fri: 7:00 am to 2:00 pm. Closed Sat and Sun.

Call (340) 690-4994 or email info@tradewindschiropractic.com. We take walk-ins and same-day appointments. New patient forms are on the forms page to print and fill in.

Questions patients ask

What causes pain at the base of my thumb?

Usually one of two things. A tendon on the thumb side of the wrist gets irritated from repeated loading, which gives pain running from the thumb into the wrist and hurts most when you lift with the thumb up or wring out a cloth. Or the joint at the very base of the thumb is wearing, which gives a deeper ache right at the base that flares with pinching, keys and jar lids. An examination tells them apart, and they are managed differently. Call (340) 690-4994.

Why does my thumb hurt when I grip something?

Because both common causes are load problems and gripping loads both. If the pain runs up the thumb side of the wrist and is worst lifting with the thumb pointing up, it is more likely the tendons. If it sits deep at the base of the thumb and is worst pinching, turning a key or opening a jar, it is more likely the joint. Stiffness in the morning and a grip that has quietly weakened lean toward the joint.

Why do my wrist and thumb hurt from lifting my baby?

Lifting a baby under the arms puts the thumb and wrist in the exact position that irritates the tendons on the thumb side of the wrist, and you do it dozens of times a day with a load that keeps getting heavier. It is one of the most common reasons new parents end up with thumb pain. Changing the lift, hands lower under the ribs and wrists kept straight, usually helps more than trying to rest a hand you cannot stop using.

Is thumb pain arthritis or a tendon problem?

Where it hurts and what sets it off are the clues. Tendon irritation runs from the thumb into the wrist, follows a stretch of heavy repetitive use, and flares with lifting and wringing. Joint wear sits right at the base of the thumb, flares with pinching and turning, often comes with morning stiffness, and over time the joint can look squared off. They are not treated the same way, so it is worth having it examined rather than guessing.

Should I wear a brace for thumb pain?

A support worn during the tasks that aggravate it is reasonable, and pharmacies carry ones that fit the thumb and wrist. It works best as a way of unloading the thumb during specific activities rather than something worn constantly, since hands stiffen and weaken when they do nothing. What matters more is changing how the hand is loaded the rest of the day.