A sprained thumb is when the ligaments in the thumb are overstretched or torn, usually due to the thumb being forcefully pulled back, bent sideways, or jammed. Ligaments help stabilise the thumb joints, so when they’re injured, it can affect grip strength, thumb control, and everyday hand function.

An analogy…

Imagine the thumb joint like a hinge held together with elastic bands (the ligaments). If the bands get stretched or snapped, the hinge feels loose or unstable, that’s how a sprained thumb works.

What are other names that a sprained thumb can be called?

Thumb Sprain, Skier’s Thumb

What causes a sprained thumb?

The most commonly injured ligament in a thumb sprain is the ulnar collateral ligament (UCL) at the base of the thumb, near the metacarpophalangeal (MCP) joint. This ligament helps resist sideways force. A sprain usually happens when the thumb is forced away from the hand, stretching or tearing the ligament, often from falling, catching the thumb, or impact during sports.

What are the signs and symptoms of a sprained thumb?

• Pain at the base of the thumb, especially near the webbing between thumb and index finger
• Swelling and bruising in the same area
• Difficulty gripping, pinching, or lifting objects
• Weakness or looseness in the thumb
• Tenderness to touch and limited thumb movement
• In severe cases, the thumb may feel unstable or bend excessively to the side

What tests are used to diagnose a sprained thumb?

Mild (Grade 1) sprains usually heal in 1 to 2 weeks with rest and protection. Moderate (Grade 2) sprains with partial tearing can take around 3 to 6 weeks. Severe (Grade 3) sprains with a complete ligament tear or joint instability may take 6 to 8 weeks or more, and may require splinting, bracing, or even surgical repair.

How does a sprained thumb happen?

• Falling on an outstretched hand while the thumb is stretched away
• Skiing accidents
• Contact sports
• Jamming or catching the thumb during activity or work
• Poor grip technique or thumb strain from tools, weights, or repetitive use

What treatment can help a sprained thumb?

• Rest and protection with a thumb brace or splint
• Ice to reduce swelling and inflammation
• Anti-inflammatory medication if needed
• Gentle thumb movement and grip exercises once the pain settles
• Taping or buddy strapping during return to sport or physical activity

What exercises or stretches can I do for a sprained thumb?

• Thumb range of motion exercises
• Pinching and grip drills using soft putty or a sponge
• Isometric thumb strength exercises
• Functional hand movements to retrain coordination and dexterity
• Progressive return to gripping, writing, or sports tasks

What products can help with a sprained thumb?

• KT Pilates Band Pack
• KT Trigger Ball