Unani (Greco-Arabic Medicine)
The Humoral System That Bridged Greece, Islam, and India
Evidence grade 1 of 5, Untested. Read how the Atlas grades evidence.
Unani's evidence picture is that of a coherent traditional system whose framework is historical and whose individual remedies range from validated to untested. The humoral theory itself is not supported by modern science, the four-humor model was set aside by biomedicine. But Unani's historical importance is immense and well documented: Avicenna's Canon was a foundational medical reference in both the Islamic world and European universities for roughly six centuries, and the tradition helped preserve and advance Greek medical knowledge, pharmacology, and hospital-based teaching. Individual Unani herbal formulations are the subject of ongoing modern research, with mixed and generally preliminary results. The honest framing: a tradition of profound historical influence (it helped seed Western medicine), still practiced and government-recognized in South Asia, whose humoral theory is obsolete but whose specific remedies are a legitimate, under-studied research subject, not blanket-validated and not blanket-dismissed.
Reference only. Not medical advice.
What can go wrong
Risks are those of any traditional herbal and mineral system. Some Unani mineral preparations, the kushta class, parallel Ayurvedic bhasma and can contain heavy metals such as lead, mercury, or arsenic, sometimes as contamination and sometimes as intended ingredients; this hazard is covered in depth in the bhasma entry. In a 2008 JAMA study of traditional South Asian medicines about one in five tested products contained detectable toxic metals, and market surveys in India and Pakistan have found metals above permissible limits in a share of herbal formulations. Herbal products vary in quality and can interact with prescription medicines, and cupping and bloodletting carry the usual infection and anemia risks if poorly done. The largest danger, as with any traditional system, is substituting it for effective treatment of serious, time-sensitive disease. Anyone who is pregnant, managing a chronic or serious condition, or taking prescription drugs should speak with a qualified healthcare provider before using Unani products, and the mineral preparations warrant genuine caution and testing. The day-to-day regimen and diet emphasis is generally low-risk.
Unani, from a word meaning Greek, is the great connecting system of world medicine, a living tradition that carried the humoral theory of Hippocrates and Galen through the Islamic Golden Age into South Asia. Its central synthesis is Avicenna's Canon of Medicine, completed around 1025 and used as a standard text in European and Islamic teaching for centuries. It holds that health is the balance of four humors, blood, phlegm, yellow bile, and black bile, shaped by an individual temperament, and it treats through personalized diet and regimen, herbal and mineral drugs, cupping and bloodletting, and historically surgery and bone-setting. The humoral framework is obsolete in modern terms, but the historical influence is immense and it remains an official, government-recognized system in India, Pakistan, and Bangladesh. The honest read is a profound historical bridge, an obsolete explanatory model, and specific remedies that are under-studied rather than validated, with a heavy-metal caution in its mineral pharmacy that parallels Ayurvedic bhasma.
The living humoral system that carried Greek medicine through the Islamic Golden Age into South Asia, Avicenna's Canon shaped Europe for centuries; still official in India and Pakistan.
What people take it for
These are the reasons people give for taking it. They are not effects it has been shown to have.
How it is supposed to work
The humoral framework (four humors, temperaments, constitution) is a historical theoretical model, not a biomedical mechanism, and its physiological claims are not validated in modern terms. Where Unani treatments work, the mechanisms are the same as for the herbs, minerals, diet, and physical therapies they employ, conventional pharmacology and physiology. The system's lasting contribution is as much methodological (Avicenna's emphasis on observation, rational classification, and systematic case description) as it is about specific remedies.
What people get wrong
Often saidUnani is just outdated Greek superstition with no relevance today.
ActuallyIts humoral theory is obsolete, but its historical influence is immense and it is still a living, government-recognized system. Avicenna's Canon, completed around 1025, was a standard teaching text in both Islamic and European universities into the early modern period, and Unani physicians made real advances, including al-Zahrawi's surgical instruments and Ibn al-Nafis's description of the pulmonary circulation around 1242. Its specific remedies are an under-studied research subject, not a settled failure, and the WHO issued training and practice benchmarks for Unani in 2022.
Often saidBecause Unani is ancient and natural, its preparations are all safe.
ActuallySome Unani mineral preparations, the kushta class, parallel Ayurvedic bhasma and can contain heavy metals. In a 2008 JAMA study of traditional South Asian medicines, 20.7% of tested products contained detectable lead, mercury, or arsenic, and market surveys of Indian and Pakistani herbal medicines have found metals above permissible limits. Herbal products also vary in quality and can interact with prescription drugs, so the system should complement, not replace, treatment for serious disease.
Often saidUnani medicine has never been tested in a modern clinical trial.
ActuallyA small number of controlled trials do exist, mostly from India's CCRUM. A 2018 Indian Journal of Medical Research non-inferiority trial in chronic plaque psoriasis (287 randomized) reported Unani formulations comparable to PUVAsol for PASI 75 with fewer side effects, and a 2023 vitiligo trial (82 randomized) found a Unani regimen comparable to PUVAsol on VASI. These are preliminary single-council results, not independent multi-center confirmation, and reviewers say most Unani studies lack randomization, controls, and standardized outcomes.
Who profits, and who pushes back
Medical historians
Document that Avicenna's Canon was a foundational reference in Islamic and European institutions for roughly six centuries, helping preserve Greek knowledge and seed Western medicine.
Hakims & AYUSH (India)
Practice Unani as a personalized, regimen-and-humor-based system, government-recognized and supported with colleges and hospitals in India and Pakistan.
Evidence reviewers
Note that the humoral framework is not supported by modern science and that specific Unani remedies are mostly preliminary and under-studied rather than validated.
Safety researchers
Flag that some Unani kushta and mineral preparations can contain heavy metals, paralleling the contamination concerns of Ayurvedic bhasma.
Where the research comes from
Most of the published research on this comes from one place. 85% of it is from South Asia (India, Pakistan today). Findings that no unrelated group has reproduced are weaker than the study count makes them look.
| Place | Share of published research |
|---|---|
| South Asia (India, Pakistan today) | 85% |
| Greek/Islamic historical world | 70% |
| Middle East & North Africa | 60% |
| Central Asia | 55% |
How we got here
Unani grew from the Greek humoral medicine of Hippocrates (c. 460-380 BCE) and Galen (born c. 129 CE), whose works were translated into Arabic during the Abbasid Caliphate, much of it through the House of Wisdom in Baghdad under Harun al-Rashid and al-Mansur. Persian and Arab physicians developed it into a full system: al-Razi (c. 854-925 CE), who separated smallpox from measles; Avicenna (980-1037 CE), whose Canon of Medicine synthesized the field; al-Zahrawi (936-1013 CE) in Al-Andalus, whose surgical encyclopedia catalogued some 200 instruments; and Ibn al-Nafis (1213-1288 CE) in Damascus and Cairo, who described the pulmonary circulation around 1242, roughly three centuries before Harvey. The tradition spread west into Al-Andalus and Europe and east into Persia and India, taking root there by about the 12th century and flourishing under the Mughals. European medicine eventually abandoned the humoral model, but Unani persisted in South Asia and is today a state-supported system in India, Pakistan, and Bangladesh.
- c. 460 BCE-c. 200 CEGreek humoral medicine of Hippocrates and Galen forms the theoretical base
- 8th-10th c. CEGreek texts translated into Arabic (House of Wisdom, Baghdad); al-Razi and others build a systematized medicine
- c. 1025Avicenna completes the Canon of Medicine, the tradition's defining synthesis
- c. 1242Ibn al-Nafis describes the pulmonary circulation, centuries before Harvey
- 13th-18th c.Latin Canon becomes a standard European university text; Unani takes root and flourishes in India under the Mughals
- 1978India sets up the Central Council for Research in Unani Medicine (CCRUM)
- 2022WHO issues benchmarks for the training and practice of Unani medicine
How it is understood
Unani, "Yunani" literally means "Greek", is the great bridging system of world medicine, a living tradition that carries the humoral theory of ancient Greece through the Islamic Golden Age into South Asia. Built on Hippocrates and Galen and synthesized above all by Avicenna (Ibn Sina) in his Canon of Medicine (~1025 CE), it holds that health is the balance of four humors, dam (blood), balgham (phlegm), safra (yellow bile), and sauda (black bile), each tied to a temperament (sanguine, phlegmatic, choleric, melancholic). Every person has a unique humoral constitution (mizaj), and disease is imbalance. Treatment is holistic and personalized: diet and regimen (regimental therapy), herbal, mineral, and animal-derived drugs, cupping and bloodletting, massage, and, historically, surgery and bone-setting in teaching hospitals. Practiced by hakims, Unani arrived in India by around the 12th-14th century and remains an official part of the healthcare systems of India and Pakistan today.
At a glance
- Name
- "Yunani" = "Greek"
- Key text
- Avicenna's Canon of Medicine (~1025 CE)
- Four humors
- Blood, phlegm, yellow bile, black bile
- Today
- Official system in India & Pakistan
What this entry does not yet cover
What follows is unfinished work on our side, not a finding about Unani (Greco-Arabic Medicine). A short entry is not a safe entry.
- Cost and market. We have not documented what it sells for or who sells it.
- Supply chain. We have not mapped where it is made.
- Who uses it. We have not documented the user groups.
- What could change. No forward-looking summary yet.
- How it compares. We have not set it against the alternatives.
- Children and teenagers. We have not checked what is known about younger people.
Sources
Etymology (Yunani from Ionia/Greek), four humors, Hippocrates and Galen, Arabic translation, al-Razi/Avicenna/al-Zahrawi/Ibn al-Nafis, spread to Al-Andalus and India, current status in India and Pakistan
Definition of Unani as Greco-Arabic humoral medicine, temperaments, Hippocrates and Galen, spread to India, current practice
Canon of Medicine completed c. 1025 by Avicenna (980-1037); Latin translation by Gerard of Cremona; used as a standard European university text into the early modern period; important text in Unani medicine
Ibn al-Nafis (1213-1288) described the pulmonary circulation around 1242, roughly three centuries before Harvey, in his Commentary on the Anatomy of Avicenna's Canon
Al-Zahrawi (936-1013) authored the Kitab al-Tasrif, a 30-volume encyclopedia cataloguing about 200 surgical instruments; its surgical section was a standard European text for centuries
20.7% of 193 traditional South Asian medicines contained detectable lead, mercury, or arsenic; rasa shastra (herbo-mineral) products contaminated 40.6% vs 17.1%; all metal-containing products exceeded acceptable daily intake standards
Non-inferiority RCT: Unani formulations UNIM-401 and UNIM-403 not inferior to PUVAsol for PASI 75 in chronic plaque psoriasis (287 randomized, 151 completed), with fewer side effects (2% vs 16.4%)
Randomized controlled trial: a Unani regimen and PUVAsol were comparably effective and well tolerated on VASI in non-segmental vitiligo (82 randomized)
Many Unani clinical trials for vitiligo exist but few were appropriately designed, controlled, and randomized with standardized outcomes
WHO benchmarks for the practice of Unani medicine, published 11 February 2022, defining minimum criteria for member states
WHO benchmarks for the practice of Unani medicine, World Health Organization
WHO benchmarks for the training of Unani medicine (2022 update), defining minimum training requirements and clinical-safety issues for member states
WHO benchmarks for the training of Unani medicine, World Health Organization
CCRUM is an autonomous body under the Ministry of AYUSH, set up in 1978, coordinating Unani research through a national network of research centres and drug-standardization work
Central Council for Research in Unani Medicine (CCRUM), Ministry of AYUSH information hub
National Council for Tibb in Pakistan is a statutory body under the 1965 Unani, Ayurvedic and Homoeopathic Practitioners Act regulating Unani education, registration, and practice
Market surveys of Indian and Pakistani traditional herbal medicines found heavy metals (lead, cadmium, arsenic, mercury) above permissible limits in a share of samples