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# Tendinitis

ten·di·ni·tis - ten-dih-NY-tis

## Definition

Tendinitis is the [inflammation](/glossary/inflammation) or irritation of a tendon - the thick, fibrous cords that attach muscles to bones. Tendons are essential for movement: when a muscle contracts, it pulls on its tendon, which in turn moves the bone. Tendinitis occurs when a tendon is overused, subjected to repetitive motions, or sustains a sudden injury, causing pain, tenderness, and mild swelling near the affected joint.

The condition can affect any tendon in the body but is most common in the shoulders (rotator cuff tendinitis), elbows (tennis elbow and golfer's elbow), wrists, knees (patellar tendinitis or jumper's knee), and Achilles tendon (the large tendon connecting the calf muscle to the heel). Tendinitis is particularly common in athletes, manual laborers, and people whose jobs or hobbies involve repetitive motions.

Modern understanding distinguishes between acute tendinitis (true inflammation, typically from a recent injury or overuse) and chronic tendinopathy (a degenerative condition where the tendon structure breaks down over time without necessarily involving active inflammation). This distinction is clinically important because the treatment approach differs - [anti-inflammatory](/glossary/anti-inflammatory) treatments are most effective for acute tendinitis, while chronic tendinopathy often responds better to progressive loading exercises that stimulate tendon repair and remodeling.

## Also Known As

Tendonitis Tendinopathy 

## Key Facts

-   • Tendinitis is one of the most common causes of musculoskeletal pain, accounting for millions of doctor visits annually. 
-   • Rest, ice, compression, and elevation (RICE) remain the first-line treatment for acute tendinitis. 
-   • Eccentric exercises - slow, controlled lengthening of the muscle-tendon unit - are the most effective treatment for chronic tendinopathy. 
-   • Risk factors include age (tendons become less flexible with aging), repetitive motions, sudden increases in activity, and poor biomechanics. 
-   • Fluoroquinolone antibiotics carry a small but serious risk of tendon rupture, particularly in the Achilles tendon. 
-   • Complete rest is often counterproductive for chronic tendon problems - controlled, progressive loading promotes healing. 

## How It Relates To Your Health

If you're experiencing pain near a joint that worsens with movement and is tender to the touch, tendinitis may be the cause. Early treatment is important because continuing to stress an inflamed tendon can lead to chronic tendinopathy or even tendon rupture, both of which are more difficult to treat.

For active individuals, understanding proper warm-up techniques, progressive training principles, and the importance of recovery days can help prevent tendinitis. If you develop tendon pain, reduce the aggravating activity, apply the RICE protocol, and see a healthcare provider if symptoms persist beyond 1-2 weeks or interfere with daily activities.

## Related Terms

[Inflammation](/glossary/inflammation)[Fascia](/glossary/fascia)

## Related Conditions

[

### Osteoarthritis

Musculoskeletal 

Osteoarthritis is the most common form of arthritis, occurring when the protective cartilage that cushions the ends of bones gradually wears down over time. This causes pain, stiffness, and reduced mobility, most often in the knees, hips, hands, and spine.

Joint pain during or after movement Joint stiffness after rest Loss of flexibility 

Chronic Learn More 

](/conditions/osteoarthritis)[

### Rheumatoid Arthritis

Musculoskeletal 

Rheumatoid arthritis is an autoimmune disease in which the immune system mistakenly attacks the lining of the joints, causing painful swelling, joint erosion, and deformity. Unlike osteoarthritis, RA can also affect other organs including the skin, eyes, lungs, and heart.

Swollen, tender joints Joint stiffness worse in mornings Fatigue and fever 

Chronic Learn More 

](/conditions/rheumatoid-arthritis)

## Sources

1.  [Tendinitis](https://www.mayoclinic.org/diseases-conditions/tendinitis/symptoms-causes/syc-20378243) - Mayo Clinic
2.  [Tendinopathy](https://www.ncbi.nlm.nih.gov/books/NBK538510/) - StatPearls / PubMed

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