Critical headache: reporting a type of headache in the acute stage of a disease, described by Avicenna.

Avicenna has introduced a type of headache and its related treatment called I uda al-Bu rani i (critical headache), in the I Fa l fi A naf a - uda al-Ka'in bi-l-Mosharakat i (section of types of participatory headaches) [[2]]. The critical stage of a disease named I Bu ran i (crisis) is the days in the course of some acute illnesses usually occurring in the climax of the disease that is accompanied by severe and sudden appearance of some symptoms and signs. [Extracted from the article]