Fainting, also known as a vasovagal attack, occurs when circulation to the brain is reduced when blood pressure drops, notes WebMD. Patients often experience a warm sensation, lightheadedness, nausea and vision problems prior to a fainting spell.
Fainting spells and drops in blood pressure can be prompted by fear, pain, emotional stress, hunger or anxiety, explains WebMD. People who use alcohol or drugs may also be prone to fainting spells. Fainting can also be passed on through hereditary genes.
Medical conditions such as low blood sugar, anemia, irregular heartbeats or seizures can prompt fainting spells, according to WebMD. People with problems with the nervous system may also have difficulty regulating their blood pressure which can lead to fainting. However, fainting does not necessarily indicate a patient has any neurological problems or heart problems.
People who have issues with regulating their blood pressure may be more prone to fainting spells, especially when moving quickly from a sitting or lying position to a standing position, states WebMD. The condition is known as postural hypotension and is more common in elderly people who have illnesses that keep individuals bedridden or who have poor muscle tone as a result of a disease or infection.