1. Mucositis: Inflammation and ulceration of the mucous membranes lining the mouth. 2. Xerostomia: Dry mouth resulting from reduced saliva production. 3. Infections: Including fungal, bacterial, and viral infections. 4. Bleeding: Due to low platelet counts. 5. Taste Alterations: Changes in taste perception. 6. Dental Caries: Increased risk of cavities due to dry mouth and changes in oral flora.