Canker sores are common in adults and children, and generally tend to cause discomfort, particularly during eating. Although several factors have been named as possible 'causes' of aphthous ulcers, trauma is the most common trigger for them. It has also been observed that they appear in patients who are under stress, or those experiencing health problems. They have also been attributed to hormonal changes, and to some types of dietary deficiencies (ie, Vitamin B12, Iron, Folic Acid, etc.). Although there is no specific treatment for the ulcer itself, except for severe cases (where usually steroids are prescribed); treatment is usually focused on the pain caused by the ulceration.