Mouth ulcers can be extremely painful and can hinder your ability to eat and speak. A mouth ulcer is definitely not a laughing matter. If you are prone to mouth ulcers, you may have noticed that you usually get them when you are extremely stressed, and this can exacerbate your misery. Sometimes, mouth ulcers can be an indication of nutritional deficiency. Taking a course of multivitamins can help get rid of the ulcers and also keep them at bay.