Possible causes of Fainting

42 conditions can cause this symptom. Most common are listed first.

• Arrhythmia (abnormal heart rhythm) Common Urgent Pediatric
• Blood loss Common Urgent Pediatric
• Dehydration Common Urgent Pediatric
• Gastrointestinal bleeding (intestinal bleeding) Common Urgent Pediatric
• Hypoglycemia (low blood glucose) Common Urgent Pediatric
• Hypotension (low blood pressure) Common Urgent Pediatric
• Long QT Syndrome (QT prolongation) Common Urgent Pediatric
• Postural hypotension (orthostatic hypotension) Common
• Seizure (epilepsy) Common Urgent Pediatric
• Vasovagal syncope (fainting) Common Pediatric
• Addison's disease (adrenal insufficiency)
• Atrial flutter (irregular heart rate) Urgent
• Atrioventricular node conduction block Urgent
• Carbon monoxide poisoning Urgent
• Hypertrophic cardiomyopathy (heart disease) Urgent Pediatric
• Transient ischemic attack (TIA, pre stroke) Urgent
• Valvular heart disease
• Ventricular tachycardia (VT) Urgent
• Alcoholism
• Allergic reaction Urgent
• Anemia (low red blood cell count)
• Anxiety disorder
• Aortic regurgitation (aortic insufficiency)
• Atrial fibrillation (irregular heart rate) Urgent
• Bradycardia (slow heart rate) Urgent
• Cardiac arrest
• Carotid artery stenosis (neck artery narrowing)
• Cerebral vascular accident (stroke) Urgent
• Cocaine abuse Urgent
• Concussion (head injury)
• Diabetic ketoacidosis (DKA, a complication of poorly controlled diabetes) Urgent
• Drug reaction
• Heat exhaustion
• Insulin overdose Urgent
• Methyl alcohol intoxication (methanol) Urgent
• Mitral regurgitation
• Mitral stenosis
• Narcotic (morphine, heroin) abuse
• Sepsis (severe infection) Urgent
• Smoke inhalation Urgent
• Vertebral- basilar artery insufficiency Urgent
• Wolff Parkinson White syndrome (WPW) Urgent Pediatric