vasovagal syndrome - a sudden drop in blood pressure with or without a decrease in heart rate that is caused by a dysfunction of the nerves controlling the heart and blood vessels ...
vasovagal syndrome
velo-cardio-facial syndrome
Vernet's syndrome
vertical retraction syndrome
vibration syndrome
virus-associated haemophagocytic syndrome
vitreoretinal choroidopathy syndrome
vitreoretinal traction syndrome ...
Some people tend to have vasovagal reactions to stress, as from seeing blood, getting hurt, or seeing someone else get hurt. This type of fainting, when vasovagal syndrome is known, is usually not dangerous.
 See also: Syncope, Arrhythmia, Fainting, Stress, Heart Disease
  
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