Tendonitis occurs due to overuse of tendons, connective tissue made of collagen fibers. Acute tendonitis can occur when use of the tendon is rapidly increased over a short period of time. This type of tendonitis normally fades with rest, but can become chronic tendonitis if untreated. Chronic tendonitis can be caused by increased activity, lowered recovery time between exertion, new footwear, or weakened muscles.
- Pain increasing over time
- Pain at the beginning of exercise, but disappearing slowly during the activity
- Injured area is tender to touch