One whiff of a plant known as the headache tree can spur intense, excruciating pain — and now scientists know why. An ingredient in the tree sets off a chain of events that eventually amps up blood flow to the brain’s outer membrane.
One whiff of a plant known as the headache tree can spur intense, excruciating pain — and now scientists know why. An ingredient in the tree sets off a chain of events that eventually amps up blood flow to the brain’s outer membrane.