Why Does My Thumb Hurt? 3 Common Causes of Thumb Pain
Thumb pain is incredibly common, and depending on where the pain is located, the cause can actually be very different.
Understanding the location of the pain can help us figure out what’s going on and guide treatment options that can help you feel better and continue doing the things you enjoy.
1. CMC Joint Arthritis (Base of the Thumb Arthritis)
If the pain is located at the base of the thumb, near where the thumb meets the wrist, one common cause is CMC joint arthritis.
This is especially common in adults over age 50.
Symptoms often include:
Pain with gripping or pinching
Difficulty opening jars
Aching with activity
Symptoms that improve with rest
Increased pain in colder weather
This condition is caused by osteoarthritis, meaning the cartilage in the joint gradually wears down over time. This can be part of the normal aging process as we mature.
Patients often notice tenderness right at the base of the thumb and weakness with hand activities.
2. De Quervain’s Tenosynovitis
If the pain is located a little further up the thumb side of the wrist, this may be more consistent with De Quervain’s tenosynovitis.
Unlike arthritis, this is not primarily a joint problem. Instead, it reflects inflammation of the tendons near the thumb.
Symptoms may include:
Pain along the thumb side of the wrist
Tenderness over the tendons
Swelling in the area
Pain with lifting, gripping, or twisting motions
This condition can happen at almost any age and is often related to repetitive overuse.
We commonly see this in new parents, especially mothers who are repeatedly lifting and carrying their baby. The repetitive motion can irritate these tendons over time.
The location of the pain is different from thumb arthritis, which helps us distinguish the two conditions.
3. Trigger Thumb
If the pain is slightly higher in the thumb and you notice that the thumb catches, locks, or gets “stuck” when trying to bend or straighten it, this could be due to trigger thumb.
This is another very common orthopedic condition.
Trigger thumb occurs when inflammation develops around the structures that help guide and support the tendon as it moves.
Symptoms can include:
Locking or catching of the thumb
Pain when bending or straightening the thumb
A clicking sensation
Tenderness at the base of the thumb
Sometimes patients describe feeling like they have to “force” the thumb open.
Why Location Matters
One of the most important clues when evaluating thumb pain is exactly where the pain is located.
Even though these conditions can all affect the thumb, they involve very different structures:
Arthritis affects the joint
De Quervain’s affects the tendons
Trigger thumb affects the tendon pulley system
Because of this, treatment approaches can differ significantly.
The Bottom Line
If you’re experiencing thumb pain, it’s a good idea to have it evaluated so you can understand the exact cause of your symptoms.
The good news is that there are treatments available for all of these conditions, and addressing the problem early can help you stay active, functional, and comfortable.