Neurocardiogenic syncope causes
Neurocardiogenic syncope occurs when the part of the nervous system that regulates heart rate and blood pressure temporarily malfunctions. Usually in response to some sort of trigger such as fear or the sight of blood, the heart rate slows down, and the blood vessels in the legs dilate. This causes blood to pool in the lower region of the body, and therefore a lack of blood and oxygen to the brain which causes fainting. This is similar to what happens when one feels faint after suddenly standing up. When a person faints, gravity causes blood flow to to the brain to be restored and the person gains consciousness. Neurocardiogenic syncope is a symptom of the body, rather than a disease. Possible triggers causing neurocardiogenic syncope are as follows;
- Seeing blood or losing blood
- Pain
- Emotional stress or anxiety
- Prolonged standing
- Heat
- Physical exertion
- Defecation or urination
- Standing up suddenly
- Coughing spells
- Certain "sensitive periods" such as during a viral illness or menstruation