Aphthous stomatitis is not considered to be true aphthous stomatitis by some sources. Some of these conditions may cause ulceration on other mucosal surfaces in addition to the mouth such as the conjunctiva or the genital mucous membranes. Resolution of the systemic condition often leads to decreased frequency and severity of the oral ulceration. Behçet's disease is a triad of mouth ulcers, genital ulcers and anterior uveitis. The main feature of Behçet's disease is aphthous-like ulceration, but this is usually more severe than seen in aphthous stomatitis without a systemic cause, and typically resembles major or herpetiforme ulceration or both. Aphthous-like ulceration
Aphthous stomatitis and aphthous stomatitis is probably related to nutritional deficiencies caused by malabsorption. Less than 5% of people with RAS have Celiac disease, which usually presents with severe malnutrition, anemia, abdominal pain, diarrhea and glossitis (inflammation of the tongue). Sometimes aphthous-like ulcerations can be the only sign of celiac disease. Despite this association, a gluten-free diet does not usually improve the oral ulceration. Other examples of systemic conditions associated with aphthous-like ulceration include reactive arthritis, and recurrent erythema multiforme. Diagnosis is mostly based on the clinical appearance and the medical history. The most important diagnostic feature is a history of recurrent,