Can vaccination cause inflammation of the supraspinatus tendon?

Generally speaking, vaccination does not directly cause inflammation of the supraspinatus tendon. The detailed explanation is as follows:

Vaccines work by stimulating the body's immune system to produce antibodies. They are usually injected into the deltoid muscle area, a process that is mild and only triggers a systemic immune response, without directly damaging or irritating the supraspinatus tendon within the shoulder joint. Supraspinatus tendonitis is typically associated with long-term overuse, trauma, poor posture, or degeneration of the rotator cuff, rather than vaccination. Shoulder discomfort experienced by some individuals after vaccination is usually due to minor local muscular reactions, which are fundamentally different from tendon inflammation.

If shoulder discomfort occurs after vaccination, appropriate rest and avoidance of strenuous activity are recommended, along with applying a warm towel to the affected area to relieve symptoms. In daily life, avoid maintaining the same posture for prolonged periods, ensure even force distribution when lifting heavy objects, and prevent excessive shoulder loading. Perform proper warm-up exercises before physical activity to enhance shoulder muscle strength and flexibility. If persistent shoulder pain or restricted movement occurs, seek medical attention promptly for accurate diagnosis and targeted treatment to alleviate symptoms and prevent worsening conditions that may affect daily life.