Title: Blacking Out When Standing Up: Causes And How To Prevent It?
Headings: Blacking Out When Standing Up: Causes And How To Prevent It?
Blacking Out When Standing Up: Causes And How To Prevent It?
Reasons For Blacking Out When Standing Up
How To Prevent Blacking Out When Standing Up?

Content: Blackout is felt when you suddenly stand up because large proportion of blood gets pooled in the lower leg. It is a vasovagal reaction. This leads to sudden fall in blood pressure. The other name for such episode is postural hypo-tension. It has nothing to do with the blood vessels of the leg, but something to do with the nerves. The vasovagal center in the brain which is responsible for contraction of blood vessels in the legs discharges signal to dilate and thus the blood is pooled. This happens when a person stands up suddenly from sitting position. There are several non cardiac causes such as dehydration resulting from severe diarrhea, overheating, anemia etc. Due to sudden fall in blood pressure, the blood circulation in brain is hampered for a second and that results in blackouts. It is a momentary episode and a person regains his vision quickly.