To control bleeding, press firmly on the wound with a clean cloth or sterile gauze using the palm of your hand and maintain that pressure until the bleeding stops. This single action, direct pressure, is the most effective first aid technique for the vast majority of bleeding injuries. How long you hold, what materials you use, and what you do next depends on the severity of the wound and where it is on the body.
Recognizing Serious Bleeding
Not all bleeding requires the same urgency. A small scrape that oozes and stops on its own is very different from a wound that won’t quit. Serious, life-threatening bleeding is red and flows continuously. It may be squirting with each heartbeat. If you see roughly a half can of soda’s worth of blood on the ground, or blood is pooling on the surface beneath someone, you’re looking at a medical emergency that demands immediate action and a call to 911.
Direct Pressure: The Core Technique
Cover the wound with sterile gauze or the cleanest cloth available and press down firmly with the flat of your palm. You need real force here. It should actually be a little uncomfortable for the injured person. Light pressure won’t compress the damaged blood vessels enough to let clotting begin.
Hold that pressure steadily without peeking. Lifting the cloth to check on progress breaks the clot that’s trying to form and restarts the process. If blood soaks through the gauze, do not remove it. Add another layer of gauze or cloth on top and keep pressing. Removing the first layer pulls away the clot forming underneath.
For deep wounds, the gauze needs to be packed directly into the wound cavity rather than just laid over the surface. This puts the pressure where the bleeding vessel actually is. Hemostatic dressings, gauze treated with clotting agents like kaolin or chitosan, are especially effective for deep wounds. Kaolin triggers the body’s natural clotting process, while chitosan works by adhering directly to tissue and sealing the wound regardless of whether clotting is functioning normally. These products require at least three minutes of firm, continuous pressure after packing.
When to Use a Tourniquet
A tourniquet is a last resort, not a first step. You move to a tourniquet when direct pressure isn’t working: the bleeding is too severe to control by hand, it’s coming from multiple places on the same limb, or the injury involves a partial or complete amputation. If the wound is somewhere you physically can’t press on effectively, a tourniquet may also be the right call.
Place the tourniquet at least 2 inches above the wound, never directly on a joint. Tighten it until the bleeding stops. This will be painful for the person, and that’s expected. Once a tourniquet is on, leave it in place. Note the time you applied it, because emergency responders will need that information. Tourniquets are designed for arms and legs only. They can’t be used on the torso, neck, or head.
Techniques That No Longer Apply
If you learned first aid years ago, you may have been taught to elevate a bleeding limb above the heart or to press on “pressure points” upstream of the wound. The American Heart Association no longer recommends either technique. Both were evaluated and found to offer no benefit for controlling external bleeding. Direct pressure on the wound itself is what works.
Bleeding on Blood Thinners
If you or someone you’re helping takes a blood-thinning medication, expect bleeding to take significantly longer to stop. These drugs reduce the blood’s ability to clot, so even minor cuts and scrapes can bleed persistently.
The technique is the same: firm, direct pressure with gauze or a clean cloth. But you’ll need to hold it longer and press harder than you might expect. For a nosebleed or gum bleed on blood thinners, press hard for at least 10 minutes straight without checking. For a wound on an arm or leg, maintain pressure and keep the injury elevated above the level of the heart while you wait for help. For a torso wound, press a clean cloth against it as hard as possible and do not let up.
People on blood thinners also face a higher risk from injuries that don’t produce visible bleeding. A fall that results in a head strike, for example, can cause internal bleeding even without an open wound. Headache, confusion, nausea, vision changes, or lightheadedness after a fall or accident should prompt an immediate trip to the emergency department. Wearing a medical alert bracelet helps first responders know about your medication if you can’t communicate.
How to Stop a Nosebleed
Lean slightly forward (not backward, which sends blood down your throat). Pinch both nostrils together below the bony bridge of the nose, squeezing firmly. Hold for 10 to 15 minutes without letting go to check. Breathing through your mouth during this time is fine. If the bleeding hasn’t stopped after 15 full minutes of continuous pressure, or if the nosebleed followed a head injury, seek medical attention.
Signs of Internal Bleeding
Some bleeding happens where you can’t see it, inside the chest, abdomen, or skull. You won’t be able to apply pressure, but recognizing the signs early can be lifesaving.
Early indicators include dizziness or lightheadedness, unusual fatigue, nausea, a faster-than-normal heart rate, and feeling short of breath. These symptoms can appear when someone has lost 15% to 30% of their blood volume. Beyond 30% blood loss, the situation becomes critical: confusion, seizures, loss of consciousness, and shock can follow.
Internal bleeding also produces location-specific symptoms. Bleeding in the head often causes a sudden, severe headache, vision problems, confusion, or weakness on one side of the body. In the chest, it can cause difficulty breathing, chest pain, or coughing up blood. Abdominal bleeding may cause swelling, a feeling of fullness, bruising across the belly, or blood in vomit, urine, or stool. Any of these warrant emergency medical care immediately.
After the Bleeding Stops
Once bleeding is controlled, cover the wound with a clean bandage and secure it in place without wrapping so tightly that you cut off circulation. Keep the injured person still and warm while waiting for medical help if the injury was significant. If blood begins spurting through the bandage after you’ve dressed it, that’s a sign the wound needs professional care right away.
For minor wounds you’re managing at home, monitor for signs of infection over the following days: increasing redness, warmth, swelling, or discharge from the wound. Change the dressing regularly and keep the area clean.