What does adenitis mean?
Adenitis is the medical term for inflammation of a gland, and in practice it most often refers to inflamed lymph nodes — the small immune structures scattered throughout the body. When lymph nodes swell and become tender in response to infection, as commonly happens in the neck during a throat infection, doctors describe this as adenitis. The word typically appears in clinical settings combined with a location: mesenteric adenitis affects the lymph nodes of the abdomen and can mimic appendicitis, while cervical adenitis involves those in the neck. Though it sounds alarming, adenitis is usually a sign that the immune system is actively fighting an infection rather than a disease in itself. Because it belongs to formal medical vocabulary, it rarely appears in everyday conversation, where people simply speak of 'swollen glands'. Understanding the term helps patients interpret diagnoses and medical reports with greater confidence.
nounInflammation of a gland or glands, especially a lymph node.
- Inflammation of a gland, most commonly a lymph node.
"The physician diagnosed mesenteric adenitis after the child's persistent abdominal pain."
"Mesenteric adenitis can mimic appendicitis, causing sharp pain in the lower right abdomen."
"Swollen, tender glands in the neck are a classic sign of cervical adenitis following a throat infection."
The plural follows the Greek-style '-itis' → '-itides' pattern used for other inflammatory disease names (e.g. arthritis → arthritides), but in practice the singular is overwhelmingly more common and the plural appears mainly in specialist literature.
"Multiple adenitides were identified on imaging across several nodal basins."
That tender lump in your neck during a sore throat isn't the infection itself — it's adenitis, your lymph nodes working overtime to fight it.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of adenitis
Adenitis derives from the Greek 'adēn', meaning 'gland', combined with the suffix '-itis', which Greek-derived medical terminology uses to denote inflammation. The term entered English through modern scientific Latin, part of the wave of anatomical and pathological vocabulary coined from classical roots from the early modern period onward. It shares its root with related terms such as adenoma, adenoid, and adenosine, all built on the same Greek word for gland.
How adenitis is actually used
A formal medical term used almost exclusively in clinical and scientific contexts; laypeople would more likely say 'swollen glands'. It frequently appears in compound forms naming the affected site, such as mesenteric or cervical adenitis.
Easily confused with adenitis
Adenopathy is a general term for diseased or enlarged glands (often without specifying inflammation), whereas adenitis specifically denotes glandular inflammation.
An adenoma is a benign tumour of glandular tissue, not an inflammation, so it describes growth rather than the inflammatory condition called adenitis.