Syncope is the temporary loss of consciousness due to a sudden decline in blood flow to the brain.
Cheltenham Syncope Clinic
Neurocardiogenic Syncope (also known as Vasovagal Syncope) and Carotid Sinus Syndrome are important, treatable, yet under-diagnosed causes of recurrent blackouts. Diagnosis and management of these conditions is explained in this website.
NPR : 'In Defense of Fainting'
Writer William Loiseaux has done a bit of scientific, linguistic, cultural and historical research on the act of fainting. He's written a treatise of sorts on the topic. It's called "In Defense of Fainting," published in The American Scholar and reprinted here. (June 01, 2001)
American Academy of Family Physicians
An article entitled: Exercise-Related Syncope in the Young Athlete: Reassurance, Restriction or Referral? (November 01, 1999)