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Complete Guide

Medical Emergency Guide

When to Call 911

Recognizing Medical Emergencies

A medical emergency is any sudden, severe illness or injury that threatens life, limb, or eyesight. Knowing when to call 911 can save lives. When in doubt, call—emergency responders would rather respond to a non-emergency than have someone delay care for a true emergency. Every minute counts in a medical emergency. Your quick recognition and response can make the difference between life and death, recovery and permanent damage.

When in doubt, call 911. It's better to be safe and have EMS evaluate than to delay care for a true emergency.

Call 911 For

Difficulty breathing or shortness of breath
Chest pain or pressure
Severe bleeding that won't stop
Sudden severe pain
Loss of consciousness or fainting
Sudden confusion or trouble speaking
Signs of stroke (FACE: Face drooping, Arm weakness, Speech difficulty, Time to call 911)
Major injury or trauma

Common Medical Emergencies

Heart Attack

Blocked blood flow to the heart

✓ Chest pain or pressure, pain spreading to arm/jaw/back, shortness of breath, cold sweat, nausea. Call 911 immediately. Chew aspirin if not allergic.

Stroke

Brain blood flow interrupted

✓ Remember FAST: Face drooping, Arm weakness, Speech difficulty, Time to call 911. Every minute without treatment = brain cell death.

Breathing Emergency

Can't breathe adequately

✓ Asthma attack, allergic reaction, choking, COPD exacerbation. If struggling to breathe, lips turning blue, can't speak in full sentences—call 911.

Major Trauma

Serious injury

✓ Head injury with loss of consciousness, severe burns, deep wounds, possible broken bones causing deformity, injuries from car accidents or falls.

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Common Symptoms

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Warning Signs (Seek Care)

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When You Call 911

1

Stay Calm

Take a deep breath. Panic doesn't help. You need to think clearly. Help is on the way as soon as you call.

2

Know Your Location

The most important information! Address, landmarks, cross streets. If you don't know exactly where you are, look around or use your phone GPS.

3

Describe the Emergency

What happened? Heart attack? Car accident? Choking? Be specific. Is the person conscious? Breathing? Any known medical conditions?

4

Follow Instructions

The dispatcher may guide you through CPR, bleeding control, or other first aid. Listen carefully and do what they say. They're trained to help.

5

Don't Hang Up First

Wait for the dispatcher to end the call. They may need more information or updates. Keep your phone line open.

6

Send Someone to Meet EMS

If possible, have someone wait outside or at the street to guide emergency responders to your location. Every second counts.

7

Unlock the Door

Make sure EMS can get in. Unlock doors, clear a path, put pets away. Don't make them break down a door to reach you.

8

Prepare Information

Gather medications, medical history, allergy information, and the person's ID if possible. Have this ready for EMS.

Emergency Response Facts

📊

4-6 minutes

Brain damage begins without oxygen

📊

8-12 minutes

Average EMS response time in US cities

📊

790,000+

Heart attacks occur annually in the US

Frequently Asked Questions

When should I definitely call 911?
Call for: chest pain, difficulty breathing, severe bleeding, loss of consciousness, sudden severe pain, signs of stroke, major injuries, or any life-threatening symptom.
What if I'm not sure it's an emergency?
Call 911. Better safe than sorry. The dispatcher can help determine the level of urgency. You can also call your doctor's after-hours line or a nurse advice line.
What information do I need when I call?
Location (most important), what happened, person's age and condition, whether they're conscious and breathing, any known medical conditions or allergies.
Should I drive to the hospital instead?
For true emergencies, EMS is better. They start treatment immediately, can navigate traffic, and alert the hospital. Drive only if EMS is unavailable or the hospital is very close.
What if I call 911 by mistake?
Stay on the line and tell them it was a mistake. Don't just hang up—they'll call back or send police to check. Explain the error so they can move on to real emergencies.
Can I call 911 for someone else?
Absolutely. If you see someone having a medical emergency, call 911 immediately. Don't assume someone else has called. Be the person who takes action.
What if English isn't my first language?
911 centers have access to translation services. Tell them the name of the language you speak in English, or just start speaking in your language—they'll get a translator.
Should I give medications during an emergency?
Only if you know what's happening and have been instructed to give something. For example, aspirin for suspected heart attack (if not allergic) or an EpiPen for known allergic reaction. Otherwise, wait for EMS.
What if the person refuses care?
If they're mentally competent adults, they can refuse. If they're not mentally competent (confused, unconscious), EMS can treat. Children can't refuse life-saving care.
How do I recognize a stroke?
Remember FAST: F—Face drooping on one side, A—Arm weakness or numbness, S—Speech difficulty (slurred, can't find words), T—Time to call 911 immediately.

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Medical Emergency: When to Call 911