Mucositis
Pronunciation: myoo-koh-SY-tis
Painful inflammation and ulceration of the mucous membranes lining the mouth and gastrointestinal tract, occurring as a toxic side effect of chemotherapy or radiotherapy.
Full Definition
Oral mucositis is one of the most debilitating complications of cancer therapy, arising from cytotoxic damage to the rapidly dividing epithelial cells of the oral mucosa during chemotherapy, radiotherapy, or haematopoietic stem cell transplantation. It is graded using standardized tools such as the WHO Oral Toxicity Scale or the NCI Common Terminology Criteria for Adverse Events (CTCAE), both of which are frequently referenced in oncology-linked oral medicine documentation. Clinically it progresses from mucosal erythema to pseudomembranous ulceration, causing significant pain, dysphagia, and nutritional compromise. Editors must distinguish 'mucositis' — which implies treatment-induced toxic injury — from 'stomatitis', which is a broader term for mucosal inflammation of any cause. Grading scales cited in documents should be named precisely and their version numbers verified.
Usage
Usage note: Reserve 'mucositis' for treatment-induced mucosal injury. When grading scales are cited, specify the version (e.g., CTCAE v5.0). Do not use as a general synonym for 'stomatitis'.
In Context
- "Grade 3 oral mucositis was documented following the second cycle of 5-fluorouracil-based chemotherapy." — Oncology clinic letter
- "Prophylactic oral cryotherapy is recommended to reduce the incidence of mucositis in patients receiving high-dose melphalan." — Haematology-oncology clinical guideline