Hi.. Can understand your concern.. As per your complain Canker sores also known as Apthous ulcers can occur due to a number of reasons and at times it can occur without any reason. Although the exact cause of the ulcers is not known till date.. -In case of recurrent episodes and if the sores do not respond to other medications a Steroid therapy i.e oral intake of steroids has to be done for relief.. -In case of pain you can take anti inflammatory painkiller like Advil.. -Taking a multivitamin for a period of 15 days can help in recovering any nutritional deficiency like iron,vitamin B 12 and folic acid.. -Warm saline gargles can help.. -Gargle with 1:1 solution of benadryl and milk of magnesia can help.. -Gargle with diluted hydrgen peroxide in water can help.Apply milk of magnesia after the gargles. -Drink plenty of water to maintain hydration.. -Avoid hot ,sour and spicy foods.. -Sucking ice pops can help.. -Maintain a good oral hygiene and use alcohol free mouthwash for gargles. Hope this information helps.. If you find the answer helpful kindly write a positive review and click on found this answer helpful as a token of appreciation.. Thanks and regards.. Dr.Honey Nandwani Arora.