What is fainting?
Fainting, or syncope (pronounced sin-ka-pea) in medical language, is a sudden loss of consciousness often due to a drop in blood pressure and a loss of blood flow to the brain. Fainting is a symptom rather than a condition, and may occur due to:
- A drop in blood sugar
- Becoming overheated or dehydrated
- Standing too quickly
- Stress or emotional distress
- Taking certain medications
It tends to happen more in older people who may be less active and have poorer blood circulation or may be on medication that causes dizziness or faintness. While fainting is usually a short-lived experience and people recover within a few minutes, it can be particularly dangerous if a person falls and hits their head (risk of hematoma or internal bleeding).
In some cases, fainting can be a sign of more serious illness or disease, such as aortic stenosis or kidney failure. Cardiac syncope or cardiovascular syncope may indicate a heart condition such as bradycardia or tachycardia, or may be associated with heart failure or atrial fibrillation.