A brief sudden change in a normally constant quantity: a pulse of current; a pulse of radiation. b. Any of a series of intermittent occurrences characterized by a brief sudden change in a quantity.
Some pregnant women experience a metallic taste in their mouth during the early stages of pregnancy, because of the hormone changes. It's also fairly common to crave certain foods, or go off certain foods, and have a heightened sense of smell. Learn more about the signs and symptoms of pregnancy.
Metallic Taste. Sometimes an iron or metal taste in your mouth can be caused by vitamins . . . are you taking a vitamin that is rich in Iron . . . this can do it. Take the vitamin with a glass of milk or look for a multiple vitamin that is NOT iron enriched.