10 Possible Reasons Behind Lee Hsien Loong's Fainting Spell

Singapore stood still for a moment during the National Day Rally yesterday, which saw Prime Minister Lee Hsien Loong take ill while addressing the nation on live television.

Thankfully, he returned 80 minutes later and put his condition down to a spell of dizziness. The Prime Minister's Office released a statement shortly after revealing that Mr. Lee had felt "unsteady because of prolonged standing, heat, and dehydration".

It sounds scary and looks dangerous, but fainting is actually a common phenomenon. Described as a momentary loss of consciousness and muscle control due to low blood flow to the brain, fainting occurs in about one-third of the general population and while it could point to a more serious medical condition, the underlying causes of someone passing out are pretty varied. Here are the 10 most common health reasons for fainting: