The title page of the Shakespeare First Folio, 1623. The term folio, from the Latin folium (leaf), has three interconnected but distinct meanings in the world of books and printing. It is firstly a term for a common method of arranging sheets of paper into book form, folding the sheet only once, and a term for a book made in this way.
Quick Answer. Symptoms of a burning or burn on the tongue include pain, redness and swelling, notes Healthline. More severe burns can result in blisters and even blackened skin. Those with burning tongue syndrome experience the burning pain associated with a tongue burn, but without the hot food or drink that causes it.
An iron or B12 vitamin deficiency has been linked with a burning sensation on the tongue. An iron deficiency is caused by a decrease in red blood cells. People can acquire an iron deficiency from a poor diet that is low in iron-enriched food, from poor absorption of iron, or from major blood loss.