Functional Medicine, Siddha and Unani

Most practitioners outside South Asia and the Middle East will rarely hear the words Siddha or Unani. Yet both systems are practised by registered practitioners, taught in universities and used by millions of people, and both travel with migrant communities around the world. A patient in London, Toronto, Dubai or Kuala Lumpur may be taking a Unani preparation recommended by a hakim or a Siddha medicine sent by a relative. An integrated practitioner does not need to master either system, but should know enough to ask the right questions and recognise the main safety considerations.

This article profiles the 2 systems separately, because their origins are quite different, then considers what they share and how to approach them in practice.

Siddha

Origins

Siddha medicine is associated with the Tamil speaking regions of southern India and northern Sri Lanka. Tradition attributes it to the Siddhars, a lineage of adepts described as combining spiritual practice with medicine and alchemy. Its literature, much of it in Tamil verse, spans many centuries. Today Siddha is a regulated system of medicine in India, with undergraduate and postgraduate programmes, research institutions and public clinics, particularly in Tamil Nadu, and it is also practised in Sri Lanka.

Core concepts

Siddha shares some foundational ideas with Ayurveda but has its own vocabulary and emphases.

• 3 humours, known as vatham, pitham and kabam, whose balance governs health.
• 96 principles, or thathuvas, describing the constituents of the body and mind.
• Diagnosis through 8 methods, including examination of the pulse, tongue, eyes, voice, skin colour and urine.
• An emphasis on longevity and rejuvenation, reflecting the tradition’s alchemical roots.

Therapies

Siddha treatment includes diet and regimen, herbal medicines and a distinctive range of preparations made from minerals and metals, such as parpam and chendooram, processed through elaborate traditional methods. It also includes varmam, a system of therapeutic manipulation of specific points on the body, and external therapies such as oil applications.

Unani

Origins

Unani medicine traces its roots to ancient Greek medicine, particularly the humoral theory associated with Hippocrates and later Galen. The name derives from the Arabic word for Greek. From the eighth century onwards, physicians writing in Arabic and Persian translated, synthesised and greatly extended this knowledge. The most famous of them, Ibn Sina, known in Europe as Avicenna, wrote the Canon of Medicine, which remained a standard medical text in parts of Europe and the Islamic world for centuries. Unani medicine was brought to South Asia during the medieval period and flourished there. It is formally recognised in India and practised in Pakistan, Bangladesh and parts of the Middle East and Central Asia.

Core concepts

• 4 humours: blood, phlegm, yellow bile and black bile, known as dam, balgham, safra and sauda.
• Temperament, or mizaj: a person’s characteristic constitution, described through qualities of hot, cold, moist and dry.
• 6 essential factors: air, food and drink, movement and rest, sleep and wakefulness, mental state, and retention and evacuation, whose balance underpins health.
• The body’s own healing capacity, described as tabiyat.

Therapies

Unani treatment is commonly described in 4 categories: regimenal therapy, known as ilaj bil tadbeer, which includes cupping (hijama), massage, exercise and other procedures; dietotherapy; pharmacotherapy using herbal, mineral and animal derived preparations; and, where indicated, surgery.

What the 2 systems share

Despite their different origins, Siddha and Unani have much in common with each other and with other traditional systems.

• Both are humoral: health is described as a balance of fundamental qualities or substances.
• Both emphasise the individual constitution.
• Both give great weight to diet, daily regimen, sleep and mental state.
• Both use complex preparations, including in some cases minerals and metals.
• Both have become institutionalised in modern health systems in some countries while retaining classical texts as a core authority.

The emphasis on regimen deserves attention. Unani’s 6 essential factors, in particular, read remarkably like a modern list of lifestyle determinants of health: air quality, diet, physical activity, sleep, psychological wellbeing and elimination. Functional medicine’s lifestyle factors cover much the same ground in physiological language. Recommendations in these areas often converge, even when their justifications do not.

The evidence

Clinical research on both systems is growing but limited. Many studies are small, uncontrolled or published in journals with limited peer review, and systematic reviews frequently report low certainty of evidence. Some individual herbs used in both systems have been studied pharmacologically and in small trials, and research institutions in India have undertaken clinical studies of classical formulations. Cupping has been studied more widely, particularly for pain; reviews suggest possible short term benefits for some musculoskeletal pain outcomes but judge the evidence to be of low quality with a high risk of bias.

As with any tradition, the absence of strong evidence for a specific intervention is not proof of ineffectiveness, but it does mean that claims should be stated with appropriate uncertainty and weighed against any risks.

Safety considerations

Metal and mineral preparations

Both systems include preparations containing processed metals and minerals, which may include mercury, lead, arsenic, copper, iron, zinc and others. Traditional texts describe elaborate processing intended to render them safe, and practitioners of the systems regard properly prepared products as non toxic. Independent evidence for that claim is limited, and cases of heavy metal toxicity associated with traditional preparations have been reported. Long term use, use in pregnancy and in children, and products of uncertain origin warrant particular caution. Where exposure is suspected, blood lead or other heavy metal testing, arranged by the patient’s doctor, may be appropriate.

Cupping

Wet cupping, in which small skin incisions are made before suction is applied, carries risks of infection, bleeding, scarring and, rarely, anaemia with repeated treatment. It requires particular care in patients taking anticoagulants, with bleeding disorders or with compromised immunity. Dry cupping commonly causes bruising, which is sometimes misinterpreted in examinations.

Interactions and contamination

Herbal preparations may interact with prescribed medicines, and products bought outside regulated supply chains may be contaminated or adulterated.

Delayed diagnosis

The indirect risk common to all systems applies here too: serious conditions managed without appropriate diagnostic assessment.

Questions to ask patients

1. Are you seeing a Siddha or Unani practitioner, or taking any medicines from either tradition?
2. What were you told about your condition, and what is each medicine for?
3. Can you bring the packaging or prescription? Do you know whether any contain metals or minerals?
4. Where were the medicines obtained: from a registered practitioner, a pharmacy, online, or from family abroad?
5. Have you had cupping or other procedures, and how often?
6. Are you using these alongside your other treatment, or instead of it?

An illustrative scenario

A 40 year old woman, recently moved abroad, presents with fatigue, abdominal discomfort and a blood count showing mild anaemia. The history reveals that for 18 months she has taken a traditional preparation sent by a relative for recurrent joint pain, and has had monthly wet cupping. Her doctor investigates the anaemia in the usual way, and, prompted by the integrated history, adds a blood lead level. The result is raised. The preparation is stopped and sent for analysis, her anaemia is managed, and her joint pain is reassessed with a plan that includes physiotherapy. Throughout, the conversation acknowledges her reasons for using traditional care and invites her to discuss any future treatments before starting them.

A respectful stance

For many patients, Siddha and Unani are part of their family, cultural and religious heritage, and their use carries meaning beyond any single symptom. The integrated practitioner’s task is not to judge that heritage but to make the patient’s care visible and safe. That means asking about these systems with genuine interest, understanding their core ideas well enough to follow the patient’s account, being honest about the state of evidence, and paying particular attention to the safety issues that are specific to them.