The Throat chakra would seem to rule the faculty of speech, being midway between the heart and the tongue. It is also associated with clairaudience (hearing spiritual voices), and with hearing sounds, words, and music, and with taste, smell. Another function associated with this chakra is taking in and assimilating of physical and emotional nourishment. On the gross level this manifests as sensuous desire and enjoyment for food. This chakra could be associated with the astrological sign of Taurus, which in current astrology is said to ruled by the planet Venus.
In Tibetan Buddhism, this chakra is associated with the dream state of consciousness. Both Tibetans and Taoists use this chakra to access the dream state and develop the faculty of lucid dreaming.
In the Heschyastic system though, the buccolaryngeal centre: "the commonest thought, that of the intelligence, expressed in conversation, correspondence, and the first stages of prayer." [Eliade, Yoga, Immortality, and Freedom, p.410]
When this chakra is open and functioning well, with a strong flow of Chi, one finds it easy to express oneself, and one's speech is clear and smooth. When it is blocked, not only does one find speaking or getting the right words out difficult, but one also feels an unwillingness to change.
When there is an insufficient flow of love or emotional nourishment to the Heart-chakra, the person may try to compensate by desire for physical nourishment through the Throat Chakra. Problems with gluttony or compulsive eating would then result. When there is also a negative functioning in the base-of-the-neck chakra (negative self-image) the result could be bulimia and anorexia.
