Angular cheilitis and glossitis (inflammation of the tongue). It is not completely understood how iron deficiency causes AC, but it is known that it causes a degree of immunocompromise (decreased efficiency of the immune system) which may in turn allow an opportunistic infection of candida. Vitamin B2 deficiency (ariboflavinosis) may also cause AC, and other conditions such as redness of mucous membranes, magenta colored glossitis (pink inflammation of the tongue). Vitamin B5 deficiency may also cause AC, along with glossitis, and skin changes similar to seborrhoeic dermatitis around the eyes, nose and mouth. Vitamin B12 deficiency is sometimes responsible for AC, and
The Canon of Medicine The Canon of Medicine The Canon of Medicine ( "al-Qānūn fī al-Ṭibb") is an encyclopedia of medicine in five books compiled by Persian physician-philosopher Avicenna (Ibn Sina) and completed in 1025. It presents an overview of the contemporary medical knowledge of the medieval Islamic world, which had been influenced by earlier traditions including Greco-Roman medicine (particularly Galen), Persian medicine, and Indian medicine. "The Canon of Medicine" remained a medical authority for centuries. It set the standards for medicine in Medieval Europe and the Islamic world and was used as a standard medical textbook through the 18th century in Europe. It