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dizzyness, black out

i have problems with sinsus, I held my nose and blew out.  I almost blacked out, I am still feeling a little light headed.
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1668617 tn?1313027715
yea dont do that thats not good for you it can make you feel light headed because the oxygen is going to your head
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1716230 tn?1313581933
It happens - blowing your nose too hard can temporarily cause the blood vessels to constrict causing transient hypoxia - lack of oxygen for a short space of time.  I doubt it would make you black out, more likely cause you the light-headed feeling you had and perhaps a little unstable on your feet.  It's probably nothing serious if it is only occurring when you blow your nose - some people get it when they sneeze or if they have a tantrum because when the blood vessels narrow, your blood pressure will raise temporarily.  If it especially troublesome and you are overly concerned, I suggest going to your doctor and having your BP checked. Hope this helps.
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1722641 tn?1309459148
You probably performed the valsalva maneuver accidentally.  Some people do pass out from this but it's not harmful unless you fall when go out and hit something.  
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351246 tn?1379682132
Welcome to the MedHelp forum!
Yes, a strong nose blow can trigger a vasovagal attack and make you feel dizzy. There is nothing much you can do about it except take fluids and eat healthy. Also sinusitis can infect ear which can also cause dizziness. Hence consult an ENT doctor to rule this out.
You could also be having EBV or infectious mononucleosis and this needs to be ruled out by blood tests. Please consult your PCP for primary examination followed by proper referral. Take care!
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