Aphthous stomatitis caused by a reduction in numbers of CD4+ T cells may be implicated in RAS-type ulceration in HIV infection. The thickness of the mucosa may be an important factor in aphthous stomatitis. Usually, ulcers form on the thinner, non-keratinizing mucosal surfaces in the mouth. Factors which decrease the thickness of the mucosa increase the frequency of occurrence, and factors which increase the thickness of the mucosa correlate with decreased ulceration. The nutritional deficiencies associated with aphthous stomatitis (Vitamin B12, folate, and iron) can all cause a decrease in the thickness of the oral mucosa (atrophy). Local trauma is also associated
Medicine in ancient Rome the initial object that allowed the stabilization of these humours. By contrast, drugs, venesection, cautery and surgery were drastic and were to be used only when diet could no longer help. The survival and amendment of Hippocratic medicine is attributed to Galen. He writes that a physician "must be skilled at reasoning about the problems presented to him, must understand the nature and function of the body within the physician world and must "practice temperance and despise all money". The ideal physician treats both the poor and elite fairly and is a student of all that affects health. Galen references