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.
Colon cancer Colon cancer is often asymptomatic, but it can cause constipation, bowel obstruction, bloody stool and more. Taking iron supplements Taking iron supplements can cause chest pain, headache, a metallic taste in your mouth, nausea, and more. Constipation (child) Constipation is having less than three bowel movements a week, causing hard stools, abdominal pain and more.