 [ Symptoms ] what should i do if i suspect an overdose of cholecalciferol vitamin d3 [ Disease ] it sounds like you have canker sores also called aphthous ulcers they are quite common and can typically be easily treated by your primary care doctor they will typically go away on their own to help with the pain and healing your doctor may prescribe a mouth rinse certain medical problems can also make canker sores more likely conditions often associated with canker sores are autoimmune conditions such as ms and even hypothyroidism    conditions where the immune system mistakenly attacks parts of your own body so if you tend to get these frequently you should let your doctor know so you can be better prepared to treat them when they happen you may first visit your family physician primary healthcare provider as most of your disease conditions are interdependent after assessing which one to be treated on priority your physician will guide you to the respective speciality doctor