Obviously it's possible to have mouth ulcers and Hasimoto's simultaneously, however ulcerations are not a symptom of Hasimoto's. Also called, medically, chronic lymphocytic thyroiditis, the primary symptoms are tiredness, weight gain, chronic constipation and others. Incurable, but easily treated with synthetic thyroid medication. In some cases, the thyroid gland at the base of the front of the neck swells significantly, in which case surgical removal is often indicated...