WHAT CAUSES FAINTING? SCIENTISTS FINALLY HAVE AN ANSWER

Summary from the TLDR newsletter

40% of people faint at least once in their lifetime. Researchers have discovered a neural pathway that connects the heart to the brain stem that, when activated in mice, causes them to become immobile almost immediately. This pathway may hold the key to understanding fainting. Further study of the pathway could inspire new treatment approaches for fainting due to cardiac causes.