Does anyone else have issues with mouth sores(canker sores)? Was diagnosed 8 months ago with hypothyroidism, started with levothyroxine as meds... am now on synthroid, still not feeling "normal self" and have gained almost 25 lbs... have taken all wheat, corn, & gluten out of diet and am still getting mouth sores! What causes these, and is there any hope to not keep getting them..any help on these issues would be greatly appreciated