Myxedema coma: Myxedema coma is a rare, life-threatening condition, occurs late in the progression of hypothyroidism. The condition is seen typically in elderly women and is often precipitated by infection, medication, environmental exposure, or other metabolic-related stresses.
Unconsciousness: Loss of consciousness that may result from a wide variety of causes. An unconscious person is usually completely unresponsive to their environment or people around them. Unconsciousness can occur as a result of brain injury, lack of oxygen or poisoning as well as numerous other conditions.