Heavy Bleeding: First Aid, Causes and Warning Signs

First aid: how to stop heavy bleeding

1. Call for help. For severe bleeding, call 911 or your local emergency number first or have someone call.
2. Protect yourself with gloves or a plastic bag if available.
3. Find the source and apply firm, direct pressure with a clean cloth, gauze or your hand. Push hard. Do not lift to check for at least 10 minutes.
4. Add more layers if blood soaks through. Do not remove the first dressing.
5. Pack deep wounds: for a gaping wound in the groin, armpit or neck, push gauze or cloth into the wound and press firmly.
6. Tourniquet for limbs: if bleeding from an arm or leg is life-threatening and pressure does not stop it, apply a tourniquet 5 to 8 cm (2 to 3 inches) above the wound, not on a joint. Tighten until bleeding stops. Note the time.
7. Keep the person warm and lying down. Raise the legs if there is no leg injury.
8. Do not remove large embedded objects; pad around them.

The American College of Surgeons' Stop the Bleed course teaches these skills in about an hour.

Recognizing dangerous blood loss

An adult has about 5 liters (10 to 11 pints) of blood. Losing more than about 15% causes a faster pulse, and more than 30% causes falling blood pressure and shock.

Children compensate well and then deteriorate suddenly. Older adults and people on beta-blockers may not develop a fast pulse.

Common causes of heavy bleeding

Injuries

Deep cuts, especially on the scalp, face, hands and over arteries, bleed heavily. Most cuts stop within 10 minutes of pressure. See laceration for wound care and when stitches are needed.

Heavy periods

Heavy menstrual bleeding means losing enough blood to affect daily life: soaking a pad or tampon every 1 to 2 hours, passing large clots, periods over 7 days, or needing to change pads at night. Causes include fibroids, polyps, adenomyosis, hormonal changes, IUDs and bleeding disorders. Heavy periods are a common cause of iron-deficiency anemia.

Nosebleeds

Most nosebleeds come from the front of the nose and stop with 10 to 15 minutes of pinching the soft part of the nose while leaning forward. Bleeding from the back of the nose, more common in older adults with high blood pressure, can be heavy and needs urgent care.

Bleeding from the nipple

Bloody discharge from the nipple is usually caused by a benign growth in a milk duct (intraductal papilloma), duct ectasia, or nipple injury and cracked skin from breastfeeding. Because it can occasionally be a sign of breast cancer, especially when it is spontaneous, from one duct and one breast, see a doctor for breast imaging. Heavy, continuous bleeding from the nipple is unusual and needs prompt assessment. See nipple bleeding or discharge.

Internal bleeding

Bleeding inside the body is not always visible. Signs include vomiting blood or coffee-ground material, black tarry stools, blood in the urine, coughing up blood, and abdominal pain or swelling after an injury. Internal bleeding needs emergency care.

Bleeding disorders and blood thinners

Excessive bleeding from small cuts, after dental work, or with periods can be a sign of:

• Von Willebrand disease: the most common inherited bleeding disorder, affecting about 1% of people, often unrecognized in women with heavy periods.
• Hemophilia: mainly affects males; causes bleeding into joints and muscles.
• Low platelets (thrombocytopenia): pinpoint red spots (petechiae), bruising and gum bleeding.
• Medicines: warfarin, direct oral anticoagulants (such as apixaban and rivaroxaban), aspirin, clopidogrel, and NSAIDs. Some supplements, such as fish oil and ginkgo, add to the effect.
• Liver disease and vitamin K deficiency.

How doctors find the cause

For sudden heavy bleeding, the priority is to stop it and replace blood. For recurrent bleeding, a doctor will ask about the pattern, family history, medicines, and bleeding after surgery, dental work or childbirth. Tests may include:

• complete blood count (hemoglobin and platelets) and iron levels
• clotting tests (PT/INR, aPTT) and fibrinogen
• von Willebrand factor and specific clotting factor levels
• pelvic ultrasound for heavy periods
• endoscopy for gut bleeding, imaging of the breast for nipple bleeding

Treatment

• Injuries: pressure, wound closure, and surgery for damaged vessels. Blood transfusion if needed.
• Heavy periods: tranexamic acid, hormonal treatments including the levonorgestrel IUD, NSAIDs, iron supplements, and procedures for fibroids or polyps.
• Bleeding disorders: clotting factor replacement, desmopressin, and tranexamic acid before procedures.
• Blood thinners: never stop them without advice. For major bleeding, doctors can use reversal agents.
• Nosebleeds: cautery or nasal packing if they recur or will not stop.

Frequently asked questions

How do you stop heavy bleeding fast?

Press hard directly on the wound with a cloth or gauze and keep pressing for at least 10 minutes without checking. Add more layers if blood soaks through. For life-threatening bleeding from a limb, a tourniquet above the wound can save a life. Call 911 for severe bleeding.

What causes excessive bleeding from a small cut?

Usually blood-thinning medicines such as aspirin, warfarin or newer anticoagulants. A bleeding disorder such as von Willebrand disease, low platelets, liver disease and vitamin K deficiency are other causes. If small cuts often bleed for more than 10 minutes, ask a doctor for clotting tests.

What causes bleeding from the breast nipple?

Most nipple bleeding comes from a benign duct growth (intraductal papilloma), duct ectasia, or cracked skin during breastfeeding. Because bloody discharge can occasionally be linked to breast cancer, especially from one breast without squeezing, get it checked with a breast exam and imaging.

How much bleeding is too much during a period?

Soaking a pad or tampon every 1 to 2 hours, bleeding for more than 7 days, passing clots larger than a quarter, or feeling tired and breathless from blood loss are signs of heavy menstrual bleeding. Soaking a pad every hour for 2 or more hours needs urgent care.

What are the signs of losing too much blood?

Early signs are a fast pulse, pale and sweaty skin, thirst and dizziness on standing. Later signs include confusion, cold or gray skin, fast breathing and fainting. These signal shock and need emergency treatment.