Ulcerative colitis and mouth sores: what to know

Ulcerative colitis affects the lining of the large bowel, but inflammatory activity can be accompanied by symptoms outside the bowel. A sore may appear on the tongue, inside the cheeks, gums, or lips. Iron, folate, or vitamin B12 deficiency can also contribute, especially when bowel symptoms reduce appetite or cause ongoing blood loss. Medicines, irritation from sharp foods, dental problems, viral illness, and stress are other possibilities. The mouth finding alone cannot show whether colitis is active.

Tell your GP or gastroenterology team when the sores started, how many there are, and whether they return with abdominal pain or diarrhoea. Keep a simple symptom and food record, use a soft toothbrush, choose cool bland foods, and avoid smoking or foods that sting. Do not stop prescribed colitis medicine without advice. A clinician may inspect your mouth and consider blood tests for anaemia or nutrient deficiency, while reviewing your colitis treatment and other medicines.

Arrange a prompt GP consultation if sores last longer than expected, keep returning, make eating or drinking difficult, or occur with worsening diarrhoea, abdominal pain, fever, or unusual tiredness. Seek urgent help for severe abdominal pain, repeated vomiting, inability to keep fluids down, marked weakness, or heavy rectal bleeding. A mouth sore with facial swelling, breathing difficulty, or trouble swallowing also needs urgent assessment.

Could this sore be linked to colitis activity, a nutrient deficiency, a medicine, or a local mouth problem? Do I need an examination or blood tests? Which mouth-care products are suitable with my current treatment? What changes in bowel symptoms should prompt an earlier review?