Why Do I Feel Lightheaded When I Stand Up?

Have you ever stood up and felt a bit dizzy and lightheaded? Learn why it happens in this SciShow Quick Question!

Hosted by: Michael Aranda
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Links to Other Videos: https://www.youtube.com/watch?v=GvvH9gd1Njk

Sources:
http://www.mayoclinic.org/diseases-conditions/low-blood-pressure/basics/definition/con-20032298
http://www.aafp.org/afp/2003/1215/p2393.html
http://www.medicinenet.com/orthostatic_hypotension/page2.htm#what_is_orthostatic_hypotension
http://www.webmd.com/a-to-z-guides/hypotension-orthostatic
http://www.wisegeekhealth.com/what-is-a-head-rush.htm
http://www.heart.org/HEARTORG/Conditions/HighBloodPressure/AboutHighBloodPressure/Understanding-Blood-Pressure-Readings_UCM_301764_Article.jsp#.VsOMLrQ4Gt8