What does tendinitis mean?
Tendinitis is the inflammation of a tendon, the tough cord of connective tissue that connects muscle to bone. It commonly develops after repetitive movement, prolonged overuse, or a sudden injury, and it may cause localized pain, tenderness, swelling, and reduced mobility. Familiar examples include patellar tendinitis, Achilles tendinitis, and rotator cuff tendinitis. The word is used both in medical discussions and in everyday accounts of sports injuries, repetitive-strain conditions, and workplace discomfort. Although “tendonitis” is also a common spelling, tendinitis is the traditional form. Clinicians sometimes distinguish tendinitis, an inflammatory condition, from tendinosis, a degenerative tendon disorder, because the two can require different forms of management. Tendinitis is also occasionally confused with tenosynovitis, which specifically affects the sheath around a tendon. Knowing these distinctions can help readers interpret medical descriptions more accurately, though diagnosis in practice depends on a clinician’s examination and, when appropriate, imaging.
nounTendinitis is inflammation of a tendon, often associated with repetitive strain, sudden injury, or prolonged overuse. It can cause pain, tenderness, and difficulty moving the affected joint.
- Inflammation of one or more tendons, commonly caused or aggravated by repetitive strain, overuse, or injury.
"Her wrist improved after rest, physical therapy, and treatment for tendinitis."
"The cyclist was diagnosed with patellar tendinitis after increasing her mileage too quickly."
"Persistent Achilles tendinitis kept the sprinter from competing that season."
The formal plural is uncommon; in everyday and clinical prose, tendinitis is often treated as a mass noun.
"The chart lists tendinitides involving both wrists."
Tendinitis combines the tendon with the medical suffix -itis, meaning inflammation: essentially, an irritated tendon speaking up in pain.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does tendinitis come from?
Tendinitis combines tendon with the inflammation suffix -itis, which comes from Greek and is used in many modern medical terms. Tendon derives from Latin tendere, meaning “to stretch” or “extend,” through a form referring to a stretching cord. Related English words such as tendon, tendinous, tendency, and tensile ultimately reflect that same Latin root.
How tendinitis is actually used
Tendinitis is primarily medical terminology and is often used informally for tendon-related pain in general. The spelling "tendonitis" is also widely accepted. In clinical usage, tendinitis should not automatically be treated as synonymous with tendinopathy, which may involve non-inflammatory degeneration as well as pain.
Easily confused with tendinitis
Tendinitis describes inflammation of a tendon, whereas tendinosis describes degenerative changes in tendon tissue that are not primarily inflammatory.
Tenosynovitis specifically affects the synovial sheath surrounding a tendon, while tendinitis more generally denotes inflammation of a tendon.