Hello dear, Thanks for being on healthcaremagic.com.If you would have presented to me as an outpatient,I would have made the following clinical explanation- Light headedness lasting a few seconds with a feeling of being passing out appears likely to be due to postural hypotension or syncope(though it is not a frank syncope episode as it is not associated with loss of consciousness). I would have asked you a few questions in order to answer your query better: 1)Are you a diabetic?Any other medical history?Hypertension or cardiac disorder? 2)Are you on any drugs?If yes,please list them. 3)Is it always while you are standing or even in lying down position? Please ask a follow -up question with the above details and I hope to answer your query well.I hope it helps.