For almost any knife injury, the first job is the same: firm, steady pressure on the wound to slow the bleeding. What comes next depends on how deep the blade went and where it went. A kitchen slice and a stab to the body are different problems, and a shallow-looking wound can hide damage underneath.
How to Stop the Bleeding
Press a clean cloth hard on the wound with the flat of your hand, and don’t lift it to check. If blood soaks through, add more cloth on top instead of removing the first layer. Hold it for a full 10 minutes by the clock before you let yourself look, because peeking breaks up the clot that is just starting to form.
If you have nothing clean, use any thick fabric, such as a T-shirt or towel, or press with your gloved or bare hand. If you are alone and hurt, sit or lie down before pressing, since a person who gets faint while standing can fall and make the injury worse. Raising a cut arm or leg above heart level helps slow the bleeding too. Once it eases, a tight pressure dressing can hold the pressure in place.
Blood that spurts or pulses, or keeps flowing despite firm pressure, points to a cut artery. A person who turns pale, cold, sweaty, confused or faint may be going into shock from blood loss. In either case, call emergency services before or while you press, or have someone else call. Lay a person in shock flat and keep them warm.
If pressure and a pressure dressing don’t stop heavy bleeding from an arm or leg, a tourniquet can control it.1PubMed Central. Stop the bleed “ – Prehospital bleeding control in patients with multiple and/or severe injuries – A systematic review and clinical practice guideline A tourniquet is a tight band placed above the wound, between it and the heart, that squeezes the limb hard enough to stop blood flow. It does nothing for the neck, chest or belly, where only pressure helps.
Without a kit, a belt or a folded strip of cloth tied about two inches above the wound can work. Twist a stick through the knot to tighten it until the bleeding stops. It will hurt, and that is expected. Never loosen it yourself once it is on. Note the time you applied it and tell responders.
Never Pull Out a Stuck Knife
A blade still in the body may be acting like a plug, holding damaged blood vessels closed.2Online CPR Certification. How to Provide First Aid for a Stab Wound: A Complete Guide Pulling it out can cause sudden, life-threatening blood loss.3Saving Grace Medical Academy. Wound Care – Part 4: Impaled Objects Instead, pad bulky cloths or bandages around the blade so it can’t shift,4Saving Grace Medical Academy. Wound Care – Part 4: Impaled Objects and press around the blade, never on it.
To pad it, roll up cloths, gauze or clean towels and build them up on both sides until the padding is as tall as the exposed part of the blade. Wrap a bandage or strip of cloth around the pad and the limb or body, snug enough to hold it but not so tight that it pulls on the blade. If blood seeps through, add more padding on top and keep pressing beside the blade rather than taking anything off.
Keep the person still in whatever position feels most comfortable. Don’t let them walk around, because movement shifts the blade, and don’t try to cut or shorten it. Tell the dispatcher that an object is still in the wound. If a blade falls out on its own, apply firm pressure right away.
First Aid for Stab Wounds to the Chest, Belly or Neck
If intestines push out of a belly wound, don’t push them back in.5MedicTests. Abdominal Trauma for the EMT Cover them with a moist, clean cloth, then a plastic or watertight layer.6PubMed. The Management of Abdominal Evisceration in Tactical Combat Casualty Care: TCCC Guideline Change 20-02 Keep the covering damp, wetting it with warm water if you have it.7PubMed. The Management of Abdominal Evisceration in Tactical Combat Casualty Care: TCCC Guideline Change 20-02 For a belly wound, lying with knees bent eases strain on the wound. Give nothing to eat or drink, in case surgery is needed.
A stab to the chest can let air leak around the lung, which can build pressure and squeeze the lung and heart. That’s why first-aid kits carry chest seals, sticky patches that cover the hole. A vented seal lets trapped air escape, while a fully sealed one can let pressure build up dangerously.8PubMed. Vented versus unvented chest seals for treatment of pneumothorax and prevention of tension pneumothorax in a swine model Wipe blood away if you can so the seal sticks, then place it over the hole, ideally after the person breathes out. If you only have plastic, tape it on three sides only, which leaves one edge to let trapped air escape. If it is taped on all sides and breathing gets worse, lift one edge. Do not remove or press on a seal that is already holding; leave it for the medical team.
Let a person with a chest wound sit up or lean toward the injured side if that eases breathing. Breathing that becomes faster, shallow or harder, or a person who looks increasingly anxious and blue around the lips, suggests air is building up in the chest. A sucking or hissing sound at the wound suggests air is moving through it with each breath. Tell the dispatcher about any change, because it helps them prepare the crew.
The neck packs major blood vessels, the windpipe and the food pipe into a small space, so any deep neck stab is serious.9SAEM. Neck Trauma Press firmly on one side only, and never wrap anything around the neck. Noisy or difficult breathing, air bubbling from the wound, or a growing swelling all mean serious injury.10PubMed Central. Pre-hospital management of penetrating neck injuries: a scoping review of current evidence and guidance
Does It Need Stitches or a Doctor
A clean cut from a clean kitchen knife can often be closed 12 to 24 hours after injury, depending on where it is.11MyHealth Alberta. Cuts: When Stitches Are Needed A dirty cut is usually closed within 6 hours, or sometimes left open for cleaning first.12MyHealth Alberta. Cuts: When Stitches Are Needed No firm time cutoff for safe closing exists,13PubMed Central. Is the use of specific time cut-off or “golden period” for primary closure of acute traumatic wounds evidence based? A systematic review and doctors sometimes delay closing cuts longer than 5 cm, cuts on arms or legs, cuts with dirt in them, and cuts in people with diabetes or over 75.14PubMed Central. Is the use of specific time cut-off or “golden period” for primary closure of acute traumatic wounds evidence based? A systematic review Get seen the same day rather than waiting to see how it goes.
Some signs say a cut needs care: the edges gape, fat or deeper tissue shows, bleeding continues after 10 minutes of pressure, or it is on the face, a joint or the genitals. Once bleeding stops, gently push the sides together. If they meet easily and stay together, the cut may heal with a bandage or adhesive strips, unless it shows any of the signs above. If they spring apart, or you can see yellow fat, muscle or bone, it needs professional closure.
Hand and wrist cuts can sever tendons and nerves beneath a small opening. In nerve cuts, damage inside the nerve can stretch about three times farther than it looks.15PubMed Central. More Than Epineurium Deep: Characterizing Peripheral Nerve Damage Using High-Resolution Micro-Computed Tomography for Simulated Peripheral Nerve Lacerations Numbness, tingling or a finger that won’t bend or straighten needs a doctor even if the cut is small.
A minor cut that doesn’t need stitches can be rinsed under clean running tap water for several minutes. Use mild soap around the wound, not deep inside it. Cover it with a clean bandage and change it daily. Redness, warmth, pus or fever are signs of infection.
Do You Need a Tetanus Shot
Stab and puncture wounds count as higher-risk wounds for tetanus.16CDC. Clinical Guidance for Wound Management to Prevent Tetanus For these wounds, you need a booster if your last tetanus shot was 5 or more years ago.17CDC. Clinical Guidance for Wound Management to Prevent Tetanus Some trauma surgeons only give the booster after 10 years.18Journal of Trauma and Acute Care Surgery. Tetanus and Trauma: A Review and Recommendations A clean minor cut usually needs a booster only after 10 years.
Tetanus bacteria live in soil and dirt and can enter deep, narrow wounds where there is little oxygen, which is why a stab carries more risk than a surface scrape. A knife that has been in the garden or a workshop raises the concern.
People who never finished the tetanus series, don’t know their history, or have a weak immune system also get tetanus immune globulin (TIG), ready-made antibodies.19CDC. Clinical Guidance for Wound Management to Prevent Tetanus The vaccine and the antibody shot go in at different spots, in the same visit.20Minnesota Department of Health. Summary Guide to Tetanus Prophylaxis in Routine Wound Management
Check your records or patient portal for your last tetanus date. Tdap is a common booster you may have had at a past checkup. If you aren’t sure of your history, say so rather than guessing.
What Happens at the Hospital
The team first checks the airway, breathing and blood pressure.21PubMed Central. Clinical experience in the management of penetrating stab wounds to the neck: A retrospective analysis of 5 cases They will likely cut away your clothing to see the injuries, which is routine. You may get oxygen, a drip into a vein, and blood drawn to check your blood type in case a transfusion is needed. Staff will ask what happened, what object was used, and when, so mention anything left at the scene or still in the wound.
A bedside ultrasound then looks for blood around the heart, in the chest or in the belly.22PubMed. Ultrasonography in thoracic and abdominal stab wound injury: results from the FETTHA study For chest stab wounds, it rarely misses bleeding in the chest or belly, but it can flag a problem that a CT scan doesn’t confirm.23PubMed. Ultrasonography in thoracic and abdominal stab wound injury: results from the FETTHA study So a CT scan often follows within about half an hour.24PubMed. Ultrasonography in thoracic and abdominal stab wound injury: results from the FETTHA study
Surgery is not automatic. People in shock or with widespread belly pain go straight to the operating room.25The Journal of Trauma: Injury, Infection, and Critical Care. Penetrating Abdominal Trauma, Selective Non-Operative Management of Stable people with a belly stab wound and no such signs often avoid routine surgery.26The Journal of Trauma: Injury, Infection, and Critical Care. Penetrating Abdominal Trauma, Selective Non-Operative Management of They are watched closely with repeated exams instead,27PubMed Central. Selective non-operative management of abdominal stab wounds is a safe and cost effective strategy: A South African experience which avoids the risks of operations that weren’t needed.28PubMed Central. Selective non-operative management of abdominal stab wounds is a safe and cost effective strategy: A South African experience Expect repeated belly checks and blood tests over hours to a day or more. Report any new pain, fever or vomiting at once.
For hand cuts, doctors test each finger’s movement and feeling.29PubMed Central. Diagnostic accuracy of preoperative clinical examination in upper limb injuries Hospitals may involve police for stab wounds. Defensive cuts on the hands and arms are recorded, so describe honestly what happened.
Warning Signs After Treatment
Infection shows up as redness that spreads, warmth and pus. A fever or red streaks moving up the limb are more worrying. Return to care the same day if these appear. Also go back for bleeding that restarts through the bandage, shortness of breath after a chest wound, or belly pain that gets worse after a belly wound.
Swelling trapped inside a limb can cut off blood flow, a condition called compartment syndrome.30PubMed. Diagnosis and treatment of acute extremity compartment syndrome It is a surgical emergency, and a delay can cause lasting disability.31PubMed Central. Acute compartment syndrome: obtaining diagnosis, providing treatment, and minimizing medicolegal risk
Ordinary pain after an injury should slowly improve with rest and raising the limb, whereas compartment syndrome pain keeps climbing despite these. Pain on gently stretching the toes or fingers is a particular warning sign. Don’t wait for numbness or tingling; go to the emergency department when pain is escalating.
Recovering From a Hand Tendon Injury
By 6 months after repair, most hands reach good-to-excellent movement, around 76 to 95 percent depending on where the cut was.32PubMed Central. Outcomes of Primary Flexor Tendon Repairs in Zones 2 and 3: A Retrospective Cohort Study Grip reaches about 54 to 64 percent of the other hand at 3 months, and 80 to 90 percent at 6 months.33PubMed Central. Outcomes of Primary Flexor Tendon Repairs in Zones 2 and 3: A Retrospective Cohort Study In the most difficult finger zone, about 1 in 5 hands still had poor movement.34PubMed Central. Physical Therapy and Splinting After Flexor Tendon Repair in Zone II
A repaired tendon is weakest in the first few weeks, and sudden pulling, such as grabbing something to stop a fall, can tear it. It also needs to glide in its sheath to avoid sticking in place, which is why controlled movement starts early. Gentler early motion lowers the risk of the repair snapping but leaves more stiffness.35PubMed. Flexor tendon repair rehabilitation protocols: a systematic review No single therapy plan is proven best,36PubMed Central. Rehabilitation following surgery for flexor tendon injuries of the hand so follow your hand therapist’s plan exactly. Expect follow-up visits where the therapist adjusts the splint and exercises as the repair strengthens.
Wear the splint as directed, often for several weeks. Don’t grip or lift with the hand until cleared, and stick to your exercises, because skipping them leads to stiffness.
Caring for the Scar and Coping Afterward
Once the wound is fully closed, start silicone gel sheets daily if a scar turns red, itchy and raised.37PubMed. Silicone gel sheeting for the prevention and management of evolving hypertrophic and keloid scars Most raised scars shrink with this treatment.38PubMed. Silicone gel sheeting for the prevention and management of evolving hypertrophic and keloid scars Laser treatment can improve stubborn scars further.39Clinical, Cosmetic and Investigational Dermatology. Comparative Effectiveness of Fractional CO2 Laser and Topical Silicone Gel for Postcesarean Scars
Cut the sheet to fit slightly beyond the scar and apply it to clean, dry skin once the wound is fully closed. Wear it most of the day and night, washing the sheet and skin daily, and keep going for at least a few months. Silicone gel from a tube is an alternative if a sheet won’t stay on, such as over a joint. Protect the scar from sun for a year, and try gentle massage after the wound is fully closed to soften it.
Nightmares, jumpiness or anger in the weeks after an attack are common, and witnesses and loved ones can be affected too. Symptoms lasting over a month deserve professional help.