Whenever my child hits her knees or her hands on something hard, she passes out. She will have a headache afterwards for a little while also. We have had an EKG, and a sleep deprived EEG done on her, and they came back fine, but it is still happening. Dear Debra, While there are uncommon serious causes of passing out in children, the majority of fainting episodes are brought about by reasons that are neither serious nor life-threatening.
Vasovagal syncope is an abnormal reaction of the nerves to otherwise normal circumstances.
These nerves dictate the heart rate and blood pressure. When a vasovagal reaction occurs, the heart rate and blood pressure drop significantly. This causes a rapid drop in blood flow and oxygen to the brain, and the child then passes out. There are a number of things that can seem to set off this reaction including being frightened, the sight of blood, and getting hurt. The actual mechanism of how this reaction takes place in the body is still not exactly understood.