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
The Canon of Medicine He began writing the "Canon" in Gorganj, continued in Rey and completed it in Hamadan in 1025. The result was a "clear and ordered "summa" of all the medical knowledge of Ibn Sīnā's time". It served as a more concise reference in contrast to Galen's twenty volumes of medical corpus. "The Canon of Medicine" is divided into five books: Book 1 is made up of six theses which give a general description of medicine in general, the cosmic elements that make up the cosmos and the human body, the mutual interaction of elements (temperaments), fluids of the body (humours), human