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Syncope is caused by a temporary reduction in blood flow to the brain. This temporary reduction in the blood supply in the brain can be caused by heart diseases and, more commonly, due to other conditions that do not directly involve the heart.
Vasovagal syncope. It is the most common cause. It is produced by an involuntary reflex of the nervous system. The causes of blackout are: after taking a blood sample; an intense pain, or after certain situations, such as to urinate, defecate, or cough intensely (situational syncope). This situation can also occur with extreme emotional stress, hunger and thirst
Postural hypotension. It is the lowering of blood pressure due to a change from one body position to a more vertical position, after waking up or sitting down.
Dehydration. Causes a decrease in blood volume, and thus, blood flow in the brain.
Blood pressure drugs. They can lead to an excessive lowering of blood pressure at any time.
Diseases of the nerves of the legs in older people (especially with diabetes or Parkinson’s disease). When there is a lack of tonicity in the nerves of the legs, the blood does not return to the brain adequately.