Quick answer: Avicenna, in Arabic Ibn Sina, wrote the Canon of Medicine around 1025, the textbook that governed medicine in the Islamic world and Europe for six centuries. He perfected the doctrine of temperament, the qualities the astrologers also read, yet he kept the physician's craft separate from fortune-telling.
No single physician shaped classical medicine more than Ibn Sina. His great textbook trained doctors from Isfahan to Padua, and the theory of temperament at its heart is the same one behind medical astrology. His own view of the stars, careful and limited, is just as instructive as his medicine.
Ibn Sina and the Canon of Medicine
Avicenna, who lived from about 980 to 1037, was a philosopher, astronomer and physician of Persia. His al-Qanun fi al-Tibb, the Canon of Medicine, gathered Greek, Roman and Arabic medicine into a single ordered system across five books. Translated into Latin in the twelfth century, it became the standard medical text of European universities and was still taught into the seventeenth century. To learn medicine, for many generations, simply meant to learn Avicenna.
Mizaj, the Doctrine of Temperament
At the base of the Canon lies mizaj, temperament, the balance of the four qualities, hot, cold, moist and dry, in the body. Avicenna refined it into a subtle scale: a balanced constitution and eight kinds of imbalance, with each organ carrying its own ruling temperament, the heart hot, the brain cold and moist, and so on. Health was the right proportion for that person; illness was a temperament pushed out of true. This is the direct ancestor of the four temperaments that a classical reading still uses.
Medicine, the Qualities and the Heavens
Because the four qualities are also the qualities of the four elements, medicine and astrology shared a vocabulary. The seasons, each with its element, called for their own regimen; the Moon's cycle framed the "critical days" of a fever; the physician gathered remedies with an eye to timing. Avicenna accepted that the heavens act on the sublunar world through heat, cold and motion, the plain physics of his age. The body and the cosmos were built from one set of qualities.
The Physician and the Astrologer
What Avicenna did not accept was astrology as prediction. He is known to have written against the astrologers' claim to forecast particular events from the stars, holding that the celestial bodies influence general natures but do not determine the fate of an individual. It is a distinction worth keeping: the medicine used the shared language of qualities and cycles, while the fortune-telling that read destinies in a chart he treated as overreach. Later writers such as Marsilio Ficino would weave his temperament theory back together with planetary correspondences, building the astral medicine of the Renaissance on his foundation.
Avicenna in the Chart
His mark survives wherever temperament is calculated. When a classical reading weighs whether a chart runs hot or cold, moist or dry, and reads the constitution from that balance, it is working with categories Avicenna sharpened. The body-map of the signs, the humoral qualities of the planets and the idea of a personal constitution all pass through the Canon on their way to the modern page.
Reading Him Honestly
The Canon is a monument of its time, and its temperament theory reads best as a model for self-knowledge. Avicenna's own caution is the fitting note to end on: the shared language of qualities was never, for him, a license to predict a destiny in the stars.
Frequently Asked Questions
Who was Avicenna?
Avicenna, or Ibn Sina, was a Persian philosopher and physician who lived from about 980 to 1037. His Canon of Medicine organized the whole of Greek and Arabic medicine into one system and served as the leading medical textbook in both the Islamic world and Europe for roughly six centuries.
Did Avicenna practice astrology?
He worked with the shared language of the four qualities and celestial cycles that framed medicine, but he is known for arguing against astrology as a way to predict individual events. He accepted a general celestial influence on nature while rejecting fortune-telling, a distinction that separates the physician's craft from prediction.
Is Avicenna's medicine used today?
His specific remedies belong to the history of medicine, and his temperament theory is a symbolic framework rather than clinical practice.
Explore the Tradition
To read the temperament and elemental balance Avicenna refined, cast a free birth chart or study your constitution through a health report, which works from classical temperament rather than fortune-telling. For more traditional technique explained plainly, browse the blog.
