Repetitive stress (overuse) of the tendons, such as from hand-intensive activities, is the usual cause.
Stiffness and pain are symptoms.
Treatments include rest, ice, pain relievers, physical therapy, and sometimes steroid injections.
Consult a doctor for medical advice
Sources: Mayo Clinic and others.
More than 200,000 US cases per year
Treatable by a medical professional
Lab tests or imaging rarely required
Medium-term: resolves within months