Hemorrhage: Symptoms, first aid, and when to call 911

A hemorrhage is heavy or uncontrolled bleeding that the body cannot stop on its own. It can be external (from a wound) or internal (inside the abdomen, chest, brain, or muscle compartments). Severe hemorrhage is a medical emergency — losing more than about 30% of total blood volume can cause hypovolemic shock and become life-threatening within minutes.^1,2 For any heavy bleeding that won't stop with direct pressure, signs of internal bleeding, or bleeding from a head, chest, or abdominal injury, call 911 immediately. Urgent care can manage minor bleeding wounds that aren't worrisome enough for the ER.

What is a hemorrhage?

The word "hemorrhage" simply means heavy bleeding. Clinicians classify hemorrhage by how much blood is lost relative to total blood volume:²

Class I (up to 15% loss): usually no symptoms; the body compensates well. Class II (15–30% loss): early signs of shock — dizziness, fatigue, nausea, fast heart rate, mild shortness of breath. Class III (30–40% loss): pale, clammy skin; rapid weak pulse; rapid breathing; confusion or anxiety; falling blood pressure. Class IV (over 40% loss): severe shock — drowsiness or unconsciousness, very low blood pressure, weak or absent pulse. Class III and IV are immediately life-threatening and require trauma center care.

What are the warning signs of severe bleeding?

For external bleeding, blood that soaks through gauze quickly, spurts in time with a heartbeat (suggesting arterial bleeding), or fails to slow after 10 to 15 minutes of firm direct pressure is severe. For internal bleeding, watch for:³

Sudden severe pain in the chest, abdomen, or pelvis after an injury; pale, cool, sweaty skin; lightheadedness or fainting; rapid, shallow breathing; a fast or weak pulse; nausea or vomiting blood (which may look like coffee grounds); blood in stool (dark, tarry, or bright red); coughing up blood; or bruising and swelling that's expanding. Confusion or drowsiness can be a late sign and is an emergency.

What should you do for severe external bleeding?

The American College of Surgeons' "Stop the Bleed" steps work for adults and children:⁴

Call 911 or have someone else call. Stay safe — make sure the scene is secure. Find the source of bleeding and expose the wound. Apply firm, steady direct pressure with both hands using sterile gauze, a clean cloth, or even clothing. Do not lift the dressing to peek — add more material on top if it soaks through. If bleeding from an arm or leg won't stop with pressure, apply a commercially made tourniquet 2 to 3 inches above the wound (not on a joint), tighten until bleeding stops, and write the time on the patient's forehead or the tourniquet. A tourniquet can save a life and is unlikely to cause permanent harm if used correctly.

What about a nosebleed or other minor bleeding?

Most nosebleeds, small cuts, and bleeding from a minor injury can be controlled at home. Pinch the soft part of the nose for 10 to 15 minutes while sitting upright and leaning forward. Apply firm pressure to a cut with a clean cloth for at least 10 minutes. Skip aspirin, alcohol, and heavy exercise for several hours afterward. If a wound is deep, gaping, or longer than half an inch, head to urgent care for cleaning and possible sutures.

When should you call 911 vs. go to urgent care vs. urgent care?

Call 911 immediately for bleeding that won't stop with pressure, suspected internal bleeding, head or neck trauma, severe abdominal or chest injury, vomiting or coughing up significant blood, bright-red rectal bleeding with weakness or fainting, or bleeding in someone on blood thinners who is showing signs of shock. Use urgent care for minor cuts that need cleaning and stitches, controlled nosebleeds in someone otherwise stable, small puncture wounds, and minor wound infections. When in doubt, call 911 — bleeding can escalate fast.

Who is at higher risk for serious bleeding?

People taking blood thinners (warfarin, apixaban, rivaroxaban, dabigatran, clopidogrel, or aspirin) bleed more and stop bleeding more slowly. People with hemophilia, von Willebrand disease, or advanced liver disease are also at higher risk. Pregnant patients with sudden heavy vaginal bleeding or severe abdominal pain need emergency evaluation. If you take a blood thinner and have a fall or head injury, get evaluated even if you feel fine — internal head bleeding can develop hours later.⁵

How are hemorrhages treated in the ER or hospital?

Emergency teams start with the ABCs (airway, breathing, circulation), large-bore IV access, and rapid fluid or blood replacement. Imaging (CT or ultrasound) identifies the source of internal bleeding. Specific treatments include surgery for trauma, endoscopy for GI bleeding, interventional radiology for vascular bleeding, and reversal agents for people on blood thinners.² Severe bleeding often requires a blood transfusion.

Next steps

If you're reading this in an emergency, stop and call 911. If you're preparing — take 15 minutes to learn the Stop the Bleed basics and keep a small first-aid kit with gauze and a commercial tourniquet in your car. For minor wounds you can manage at home but want a professional look at, book a same-day visit through Solv.