Ibn Sina, who many Europeans referred to as Avicenna, was also Persian. He had many skills and professions, and he wrote approximately 450 books and articles, 240 of which still exist today. Forty of these focus on medicine.
Among ibn Sina’s significant contributions to medieval medicine were “The Book of Healing,” an expansive scientific encyclopedia, and “The Canon of Medicine,” which became essential reading at several medical schools around the world.
The universities of Leuven, in Belgium, and Montpellier, in France, used these texts into the middle of the sixteenth century.
Also called “The Law of Medicine,” ibn Sina wrote this five-volume textbook in Arabic. Later, people translated it into several languages, including English, French, and German.
A page from Ibn Sina’s ‘Canon,’ in which he laid out many recommendations for medical practice. Image credit: Ali Esfandiari, 2007
It is one of the most famous and influential books in the history of medicine.
“The Canon of Medicine” set standards in the Middle East and Europe, and it provided the basis of a form of traditional medicine, Unani, in India.
In the United States, the University of California, Los Angeles, and Yale University teach some principles of “The Canon of Medicine” in their history of medicine courses.
In part of the text, ibn Sina explains considerations for testing new medicines:
- The drug must be pure and not contain anything that would reduce its quality.
- The investigator must test the drug on one simple disease, not a condition that could have various complications.
- They should test the medication on at least two distinct diseases, because sometimes a drug might treat one disease effectively and another one by accident.
- A drug’s quality must match the severity of the disease. For example, if the “heat” of a drug is less than the “coldness” of a disease, it will not work.
- The researcher must time the process carefully, so that the action of the drug is not confused with other confounding factors, such as the natural healing process.
- The drug’s effect must be consistent, with several trials showing the same results. In this way, the investigator can rule out any accidental effects.
- Investigators must test the drug on humans, not animals, as it may not work in the same way for both.
Ibn Sina also described practical and scientific theories about psychology and mental illness.
Human anatomy and physiology
Today, the medical community attributes the first description of pulmonary blood circulation to Ala-al-din Abu al-Hassan Ali ibn Abi-Hazm al-Qarshi al-Dimashqi, now widely known as ibn al-Nafis. The physician was born in Damascus in 1213.
He said that he did not like dissecting human corpses because it contradicted the teachings of the “Quran,” and because of his compassion for the human body. Medical historians believe that he most likely did his research in animals.
The cardiovascular system
The Greek physician Galen, who lived from 129 to 216 C.E., proposed that the body created blood in the liver, that it circulated around the body, and that the muscles used it as fuel.
He also thought that holes in the septum of the heart allowed blood to flow from one side to the other of the heart.
Ibn al-Nafis believed that this was wrong.
He said that blood must flow from the right to the left side of the heart, but that there were no holes or pores in the septum, as Galen had thought.
From his experience of dissection, he noted that there must be a system of arteries that carried the blood.
He also believed that the arteries carried the blood from the right chamber of the heart to the lungs, where it would mingle with air, before moving back to the left chamber.
According to Ancient Greek medicine, a visual spirit in the eye provided sight.
Hasan ibn al-Haytham, or al-Hazen, was an Iraqi Muslim scientist who lived from 965 C.E. to around 1040 C.E.
He explained that the eye is an optical instrument and provided a detailed description of the eye’s anatomy. Later, he developed theories about the formation of images. Scholars in Europe referred to his “Book of Optics” until the 17th century.
Ahmad ibn Abi al-Ash’ath, an Iraqi physician, described how a full stomach dilates and contracts after experimenting on live lions.
Musculoskeletal system: The jaw
Abd al-Latif al-Baghdadi, an Iraqi physician, historian, Egyptologist, and traveler, lived from 1162 to 1231 C.E.
Galen believed the lower jaw to consist of two parts, but al-Baghdadi, after observing the remains of over 2,000 people who had starved to death in Egypt, concluded that the lower jaw, or mandible, consists of just one bone.
Drugs and remedies
Medieval Islamic medications were usually plant-based, as had been those of Ancient Greece, Rome, and Egypt.
Pain and anesthesia
According to a study published in 2016 in the Iranian Journal of Medical Sciences, Islamic physicians used various drugs for anesthesia. al-Razi was the first doctor to use inhaled medication for this purpose.
Plants and drugs to relieve pain and anesthesia included hemlock, mandrake, henbane, mandragora, opium poppy, and black nightshade. The patient would eat, drink, or inhale them, or they would apply them topically. Some doctors also used ice to relieve pain.
Doctors used poppies, the seeds of which contain codeine and morphine, to relieve:
- eye pain
- pain from gallbladder stones
Other medicinal herbs
Medieval Islamic physicians used a wide range of herbs, including the following:
Juniper was one of many medicinal plants.
A mixture of dill seed, chamomile flower, yellow sweetclover, mallow leaves, flaxseed, cabbage, and beetroot, boiled together and added to a bath as an analgesic for people with cancer
Garlic in many treatments, including urinary problems
Juniper or pine needles in a bath, to relieve allergic skin problems
Oregano, for its antiseptic and anti-inflammatory properties
Cinnamon for wounds, tumors, and ulcers
Cannabis and opium: Doctors prescribed these, but only for therapeutic purposes, as they realized that they were powerful drugs.
There is evidence that some people died of overdoses when using certain medications to cure forgetfulness, possibly due to medical malpractice.
Medieval Islamic physicians performed more surgeries than their Greek and Roman predecessors, and they developed new tools and techniques.
Bloodletting was a common practice. Image source: Anonymous, Persian Anatomical Illustrations [Iran or Pakistan, ca. 1680-1750], National Library of Medicine, 2013
In the 10th century, Ammar ibn Ali al-Mawsili invented a hollow syringe that he used to remove cataracts by suction.Abu al-Qasim al-Zahrawi was an eminent surgeon who lived and worked in Andalusia, Spain. He invented a number of instruments, including forceps, pincers, lancets, and specula. He also used catgut to sew up wounds.
Types of procedure
Apart from cataracts, medieval Islamic doctors also performed eye surgeries to treat trachoma.
Cauterization was a common procedure, involving burning the skin to prevent infection and stem bleeding. A surgeon heated a metal rod and placed it on the wound to clot the blood and improve healing.
Also, surgeons practiced bloodletting to restore the balance of humors, the four elements or characteristics that formed the basis of much medical practice from Greek times until the 17th Century.