Tendinitis refers to acute inflammation of a tendon, typically occurring after a sudden injury or a rapid increase in activity that overwhelms the tendon’s capacity. Tendinopathy is a broader term that describes chronic tendon dysfunction characterized by structural changes within the tendon tissue rather than acute inflammation. While these terms are often used interchangeably, the distinction matters clinically because the treatment approach for chronic tendinopathy differs significantly from that of acute tendinitis. Most patients seeking care for persistent tendon pain are dealing with tendinopathy rather than true tendinitis, which is why a proper evaluation is essential before beginning treatment.
Tendinitis and tendinopathy most commonly develop from repetitive overuse, sudden increases in training volume or intensity, poor movement mechanics that place uneven stress on the tendon, or inadequate recovery between high demand activities. They affect athletes, active individuals, and people whose work involves repetitive movements or sustained postures that load specific tendons repeatedly over time.
Common presentations include tennis elbow and golfer’s elbow from repetitive arm and wrist movements, Achilles tendinopathy and patellar tendinopathy from running and jumping activities, rotator cuff tendinopathy from overhead work or throwing sports, and wrist tendon conditions from prolonged computer use or manual labor.