What Is Shoulder Tendonitis?

Shoulder tendonitis is irritation or inflammation of the tendons in the shoulder, most commonly the rotator cuff or biceps tendon. These tendons help support shoulder movement and stability during lifting, reaching, and other arm motions.

The condition often develops from overuse or repeated stress on the shoulder. Over time, inflamed tendons can become painful and make everyday movement more difficult. Risk factors include:

• Sports that involve overhead motion
• Repetitive lifting or reaching
• Swimming, baseball, tennis, or weightlifting
• Poor shoulder mechanics
• Age-related tendon wear

In some cases, tendons become pinched between shoulder structures, causing irritation known as impingement.

Symptoms

Shoulder tendonitis symptoms may begin gradually and often worsen with activity.

Common symptoms include:

• Shoulder pain or soreness
• Pain when lifting the arm overhead
• Weakness in the shoulder or arm
• Limited range of motion
• Difficulty reaching behind the back
• Tenderness around the shoulder
• Pain that interrupts sleep

The condition is commonly linked to repetitive shoulder movements and overuse.

How Is It Diagnosed?

Healthcare providers diagnose shoulder tendonitis by reviewing symptoms and examining shoulder movement, strength, and pain levels.

Imaging tests may include:

• X-rays
• MRI scans
• Ultrasound imaging

These tests help evaluate inflammation, tendon damage, and other shoulder injuries.

How Is It Treated?

Treatment usually begins with conservative care to reduce inflammation and restore movement.

Treatment options may include:

• Rest and activity changes
• Anti-inflammatory medicines
• Physical therapy
• Stretching and strengthening exercises
• Corticosteroid injections for pain relief

Many patients improve with therapy and guided rehabilitation. If symptoms continue or severe tendon damage is present, surgery may be recommended.

Early treatment may help prevent long-term stiffness, weakness, or reduced shoulder function.