The Chin and the Naga compose about 3 % of the population of Myanmar. They are related tribes of Tibeto-Burman origin populating a couple of hundreds of kilometers of mountain range in western Myanmar (but not on the coast of the Indian Ocean) and the border area to India. Both groups also live beyond the Burmese-Indian border in India, where especially the Naga have aroused attention by their zeal for increased autonomy.

The Chin and the Naga are for the major part attached to natural religions, but an increasing number of both people have converted to Christianity.

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Physiologically, they are marked by a sudden dominance of the sympathetic nervous system, while during arousal (and the erective state), the parasympathetic nerves system ruled.