The Seven Dhatus in Ayurveda: The Body's Tissues Explained

The word dhatu comes from a root meaning to support or hold. In Ayurveda the seven dhatus are the tissues that the classical texts say make up and support the body. They are named rasa, rakta, mamsa, meda, asthi, majja and shukra, and the tradition teaches that each is nourished from the one before it in a fixed order.

This page explains each dhatu, the traditional account of how they are formed, and the ways the model compares with modern anatomy. The dhatus belong to a traditional vocabulary. They are not identical to the tissues in a physiology textbook, and this page does not diagnose or treat anything.

The seven dhatus

The Charaka Samhita and the Sushruta Samhita both list the seven. The Ashtanga Hridayam, in its teaching on the doshas, dhatus and malas, calls these three groups the root of the body. The English words given below are approximate guides, and translators differ.

1. Rasa is the first dhatu, usually translated as plasma or the nutrient fluid. It is described as the juice of digested food that circulates to nourish the rest of the body, and it is linked to a sense of satisfaction and moisture.
2. Rakta is blood, described as giving colour and life. It is said to carry vitality through the body.
3. Mamsa is muscle, the flesh that covers and shapes the body and gives strength to move.
4. Meda is fat, described as oily tissue that lubricates and insulates.
5. Asthi is bone, the hard framework that supports the body.
6. Majja is the marrow and, in the texts, also the nerve tissue and the substance within the bones and the skull.
7. Shukra is the reproductive tissue, in the texts both male and female, and is described as the most refined of the dhatus.

Teachers also speak of upadhatus, or secondary tissues, such as breast milk, menstrual fluid, tendons and skin layers. These are outside the scope of this page.

How the tissues are said to be built

The tradition’s account of nourishment is a sequence. Food is digested by the jatharagni, and its essence becomes rasa. Rasa is then transformed by the agni of the rasa tissue, called a dhatvagni, into rakta, and so on through the sequence down to shukra, with each stage refining the one before. The texts speak of this as a continuing process and not a one-time event. This ties the dhatus to agni, and the thirteen agnis include one for each dhatu.

The classical writers and their commentators offered different pictures of how the transfer happens. Some compare it with milk turning to curd, some with water flowing from one field to the next through channels, and some with pigeons that each fly straight to their own place in a field of grain. They disagree about whether each tissue is produced step by step or all at once from the food. We do not try to settle that. It is a debate within the tradition, and it shows that the model is a framework for thought and not a record of laboratory findings.

The texts also speak of the time the process takes, in general terms of about a month, but give different figures. We do not give a number here, and the claim should not be taken as a statement about physiology.

Dhatus and the doshas

Each dosha is associated with certain tissues. Kapha is linked with the early dhatus such as rasa and meda, pitta with rakta, and vata with the hard tissues such as asthi, in which it is said to dwell. The associations come from the qualities. Dry, light vata matches the hard, dry bone, and the oily, heavy kapha matches fat. This is part of why the tradition reads signs in the tissues together with signs of the doshas, as the pages on vata, pitta and kapha describe.

What happens when a dhatu is disturbed

The texts describe tissues as able to increase, decrease or be vitiated, in the same way as the doshas. They link the signs to each tissue, such as a feeling of heaviness and lack of satisfaction with rasa, or weakness with mamsa. These lists are a part of how Ayurvedic practitioners organise what they observe. They are not diagnoses, and many of the same symptoms have a range of ordinary and medical causes, so they should not be used to judge your own health.

The dhatus also give rise to waste products called malas, and the final refined essence is said to be ojas.

What modern research says

Modern anatomy and physiology describe plasma, red cells, muscle, adipose tissue, bone, marrow, nervous tissue and reproductive tissues, and it is clear that several of the dhatus broadly correspond to these. The correspondence is loose, and the idea that each tissue is made from the previous one in a fixed order is not how modern biology describes the body. Nutrition research does show that the body builds its tissues from the nutrients in food, which is the general thought behind the tradition’s emphasis on diet and digestion. No test validates the dhatu model as a diagnostic tool.

Safety notes

Reading about the dhatus is harmless, but practices said to nourish a particular tissue, such as special tonics, rich foods, herbal powders and rejuvenating preparations, are not harmless for everyone. People who are pregnant or breastfeeding, have diabetes, heart, liver or kidney disease, or take medicines should speak to a doctor first, and Ayurvedic tonics should be bought with care, since some products have been found to contain heavy metals. A concern such as lasting weakness, weight loss, bone pain or bleeding needs a doctor.

This page explains a traditional vocabulary. See the medical disclaimer, speak to a doctor about any health concern, and see a registered Ayurvedic practitioner (BAMS in India) for Ayurvedic treatment.

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