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Grade of mucositis according to the World Health Organization (WHO)
| Grade | Clinical symptoms |
|---|---|
| 0 | Absence of signs and symptoms of mucositis |
| 1 | Erythema, no ulceration |
| 2 | Erythema and ulceration, being able to swallow solid food |
| 3 | Erythema and ulceration, being able to swallow liquids, not being able to swallow solid food |
| 4 | Erythema and ulceration, not being able to swallow liquids or solid food |
