Who is Gaia?

The first Greek god was actually a goddess. She is Gaia, or Mother Earth, who created herself out of primordial chaos. From her fertile womb all life sprang, and unto Mother Earth all living things must return after their allotted span of life is over.
     Gaia, as Mother Nature, personifies the entire ecosystem of Planet Earth. Mother Nature is always working to achieve and maintain harmony, wholeness and balance within the environment. Mother Nature heals, nurtures and supports all life on this planet, and ultimately all life and health depend on Her. In time, Nature heals all ills.
     The way of Mother Gaia is the passive, feminine, Yin way of healing. All we need to do to regain our health is to return to the bosom of Mother Nature and live in accordance with Her laws. The Gaia archetype underlies all notions of the Nature Cure. Mother Nature is a healing goddess.Gaia
     In the 1960s, James Lovelock formulated the Gaia hypothesis. It states that all life, and all living things on this planet, are part of a single, all-encompassing global entity or consciousness which he named Gaia. It is this global consciousness, Mother Gaia, that makes our planet capable of supporting life, while our near neighbors in the solar system are barren and lifeless.
     Through the global consciousness of Mother Gaia, all living things on this planet, from their most primordial instincts, are constantly interacting with their environment to ensure the harmony, balance and continuity of Life. Live in a balance with Mother Nature and health and healing are yours; violate Her laws and get out of balance, and you pay the price in suffering and disease. In this sense, all medicine and healing can be seen as a system of ecology.

Excerpt taken from; Greek medicine

For additional information check out this; wikipedia Gaia mythology