Title: Blackouts | healthdirect
Headings: 
Blackouts
On this page
What is a blackout?
What causes a blackout?
How are blackouts prevented and treated?
Blackouts caused by alcohol
When should I seek help for a blackout?
Was this article helpful?

Content: It can happen when you are very hot, distressed, in severe pain, you see or smell something unpleasant, or while you are coughing or going to the toilet. Sometimes, you might black out when you stand up too quickly. This is because your blood pressure suddenly drops. Blacking out can also be caused by a serious health condition, including: arrhythmia (abnormal heart rhythm)
heart disease
problems with the blood vessels in the brain
some mental illnesses
a seizure
low blood sugar
illicit drugs
some medicines
How are blackouts prevented and treated? Treatment will depend on the cause of your blackout. For example, if it was caused by a heart rhythm problem, there are medicines that may help prevent you from having another one. However, it is not always possible to prevent blackouts. If you feel faint, lie down or sit with your head between your knees. Make sure you stand up or change position slowly.