What are some possible causes of ulcers in the mouth?

* Trauma: Biting the inside of your cheek or lip, or brushing your teeth too vigorously can cause a mouth ulcer.

* Poor dental hygiene: A build-up of plaque and bacteria on the teeth can lead to gum disease and mouth ulcers.

* Dry mouth: A lack of saliva can dry out the mouth and make it more susceptible to ulcers.

* Certain medications: Some medications, such as aspirin, ibuprofen, and chemotherapy drugs, can cause mouth ulcers as a side effect.

* Nutritional deficiencies: A deficiency of certain vitamins and minerals, such as iron, vitamin B12, and folate, can lead to mouth ulcers.

* Medical conditions: Some medical conditions, such as Crohn's disease, celiac disease, and Behcet's disease, can cause mouth ulcers.

* Hormonal changes: Women may experience mouth ulcers during menstruation or pregnancy.

* Stress: Stress can trigger mouth ulcers in some people.