Vomiting, Fainting, and Collapse: A Medical Emergency Requiring Immediate 911 Call

The combination of vomiting, fainting (syncope), and collapse is a red flag for potentially life-threatening conditions. Do not wait—call 911 or your local emergency number immediately.

Possible Causes (Not Exhaustive)

• Cardiac: Myocardial infarction, arrhythmia (VT/VF, complete heart block), aortic dissection, pulmonary embolism, hypertrophic cardiomyopathy.
• Neurological: Stroke, subarachnoid hemorrhage, seizure (post-ictal), vertebrobasilar insufficiency.
• Metabolic/Toxic: Severe hypoglycemia, diabetic ketoacidosis, adrenal crisis, electrolyte catastrophe (hyperkalemia), toxic ingestion (carbon monoxide, opioids, alcohol).
• Hemodynamic: Massive hemorrhage, ruptured ectopic pregnancy, anaphylaxis, septic shock.
• Other: Vasovagal syncope with injury, severe dehydration/heatstroke.

First Aid While Waiting for EMS

• Lay the person flat; elevate legs if no trauma/breathing difficulty.
• If unconscious but breathing: recovery position (on side) to protect airway.
• If not breathing/no pulse: START CPR (compressions 100–120/min, 2 inches deep).
• Do NOT give anything by mouth.
• Do NOT induce vomiting.
• Gather medications, medical history, allergy info for paramedics.

Even if the person "recovers quickly," the underlying cause must be diagnosed. Many serious conditions (e.g., arrhythmia, TIA, GI bleed) can present with transient syncope. Emergency evaluation is mandatory.