What does tendonitis mean?
Tendonitis is a noun denoting inflammation of a tendon, the tough band of connective tissue that attaches muscle to bone. It commonly affects tendons in the shoulder, elbow, wrist, knee, ankle, or heel and may produce pain, tenderness, swelling, or restricted movement. The term is used especially in medical contexts, where it appears in phrases such as shoulder tendonitis and chronic tendonitis. Although tendonitis accurately emphasizes inflammation, many people use it as a general label for tendon pain and stiffness. In clinical discussion, tendinopathy may be preferred when the underlying problem is degeneration or repeated overuse rather than clear inflammation. Tendonitis is therefore familiar vocabulary in sports medicine, physiotherapy, and workplace health, where accurate distinction between a tendon and its surrounding sheath can also help clarify a diagnosis.
nounInflammation of a tendon, often causing pain, tenderness, swelling, and difficulty moving the affected part.
- Inflammation of a tendon, especially at the shoulder, elbow, wrist, knee, ankle, or heel, that may cause pain and impaired movement.
"Her shoulder tendonitis made it painful to lift her laptop above her head."
"A diagnosis of tendonitis kept him from competing for several weeks."
"Rest and a gradual return to exercise helped ease her Achilles tendonitis."
Rare; tendonitis is normally treated as a singular or mass noun, so writers often say cases of tendonitis instead.
"The clinician compared two tendonites in opposite wrists."
Tendonitis puts the “itis” in tendon: a Greek-derived suffix that signals inflammation.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does tendonitis come from?
Tendonitis is a modern medical formation combining tendon with the suffix -itis, meaning inflammation. Tendon entered English through French from Latin, ultimately deriving from Greek tenōn, “sinew,” while -itis comes from a Greek form meaning “inflammation of.” The established alternative spelling tendinitis reflects the two conventions by which this medical term has developed, alongside cognates such as tendinous and tenotomy.
How tendonitis is actually used
The spelling tendonitis is common in medical usage, and tendinitis is equally established. The term is used especially in British, American, and Australian English. Because tendon disorders are not always inflammatory, it may overlap informally with the broader term tendinopathy.
Easily confused with tendonitis
Tendinitis is an established alternative spelling of tendonitis and does not denote a different condition.
Tendonitis specifically emphasizes inflammation, whereas tendinopathy is a broader term for tendon disease that may involve degenerative rather than inflammatory changes.
Tendonitis affects a tendon, while tenosynovitis affects the sheath surrounding a tendon.