A sprained thumb occurs when a ligament is overextended or torn while severely stressing a joint. Common causes include skiing injury or overextension when playing racket sports, such as tennis.
Thumb weakness, swelling, bruising, and pain are symptoms.
Treatment includes immobilizing the joint with a splint or cast and icing to reduce swelling. Rarely, surgery may be needed if the ligament is completely torn.
Consult a doctor for medical advice
Sources: Mayo Clinic and others.
More than 200,000 US cases per year
Lab tests or imaging rarely required
Short-term: resolves within days to weeks