Burn injury - Causes, Treatment & When to See a Doctor

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What is Burn injury?

A burn injury is damage to the skin, and sometimes deeper tissues, caused by heat, chemicals, electricity, radiation, or friction. Burns are classified by depth (first‑degree, second‑degree, third‑degree, and fourth‑degree) and by the percentage of total body surface area (TBSA) affected. The depth determines how the skin layers are involved, while TBSA helps clinicians estimate fluid loss and the need for specialized care.

Most burns heal without lasting complications, but severe burns can lead to infection, scarring, loss of function, and systemic problems such as shock or organ failure. Prompt assessment and appropriate management are essential to minimize tissue damage and improve outcomes.<sup>1</sup>

Common Causes

• Thermal burns – exposure to open flames, hot liquids (scalds), steam, or hot objects.
• Electrical burns – contact with household wiring, power lines, or lightning.
• Chemical burns – acids, alkalis, solvents, or industrial chemicals.
• Radiation burns – ultraviolet (sunburn), infrared, or ionizing radiation (e.g., radiation therapy).
• Friction burns – road rash or skin abrasion from rapid rubbing against a surface.
• Contact burns – sustained contact with hot surfaces such as stoves, irons, or grills.
• Flash burns – intense burst of heat from an explosion or fireball.
• Cold (freeze) burns – prolonged exposure to extreme cold, liquid nitrogen, or dry ice.
• Burns from hot food or beverages – common in children and the elderly.
• Burns related to occupational hazards – welders, chefs, lab technicians, and firefighters are at higher risk.

Associated Symptoms

Burns rarely occur in isolation. The following signs frequently accompany the primary injury:

• Redness, swelling, and pain (first‑ and second‑degree burns).
• Blister formation – clear fluid‑filled blisters in superficial partial‑thickness burns.
• White, leathery, or charred skin in deeper (third‑ or fourth‑degree) burns.
• Pain that may diminish as nerves are destroyed in deeper burns.
• Heat sensation or a “burning” feeling at the site.
• Signs of infection: increased pain, redness spreading beyond the wound, pus, foul odor, fever.
• Systemic manifestations in extensive burns: rapid heart rate, low blood pressure, dizziness, or decreased urine output.
• Respiratory distress if inhalation injury has occurred (cough, hoarseness, soot in sputum).

When to See a Doctor

While minor superficial burns can often be managed at home, certain situations demand professional evaluation:

• Burns covering more than 2% of TBSA in children or 10% in adults.
• Any third‑degree (full‑thickness) or fourth‑degree burn.
• Burns on the face, hands, feet, genitalia, or major joints.
• Signs of infection (increased redness, swelling, pus, fever).
• Persistent pain that does not improve with over‑the‑counter pain relievers.
• Signs of inhalation injury (difficulty breathing, voice changes, soot in the mouth or nose).
• Electric burns, especially if the current passed through the torso or head.
• Burns caused by chemicals that cannot be easily neutralized or removed.
• Any uncertainty about the depth or severity of the burn.

When in doubt, err on the side of caution and seek medical care promptly. Early intervention reduces complications and improves cosmetic outcomes.<sup>2</sup>

Diagnosis

Evaluation of a burn injury follows a systematic approach:

1. History

• Mechanism of injury (heat source, duration of contact, chemicals involved).
• Time elapsed since injury.
• Medications, allergies, and past medical history (e.g., diabetes, peripheral vascular disease).

2. Physical Examination

• Assessment of burn depth using tactile and visual cues.
• Estimation of TBSA using the “Rule of Nines,” Lund‑Browder charts (children), or the palmar method.
• Check for associated injuries (fractures, inhalation trauma).
• Evaluation of circulation, sensation, and range of motion in the burned area.

3. Ancillary Testing (when indicated)

• Laboratory studies: CBC, electrolytes, renal function, blood glucose, and coagulation profile.
• Serum lactate and base deficit to gauge perfusion in severe burns.
• Chest X‑ray or CT scan if inhalation injury is suspected.
• Wound cultures for suspected infection.
• Electrical injury work‑up: ECG, cardiac enzymes, and possibly echocardiography.

4. Burn Classification

After gathering data, clinicians categorize the burn by depth and extent, which guides fluid resuscitation, analgesia, and need for specialized burn‑center referral.<sup>3</sup>

Treatment Options

Treatment is tailored to burn depth, size, location, and patient comorbidities. The primary goals are to preserve life, prevent infection, relieve pain, and promote optimal healing.

1. Initial First‑Aid (Home Management)

• Cool the burn – Run cool (not ice‑cold) water over the area for 10–20 minutes.
• Remove contaminated clothing/jewelry carefully, unless they are stuck to the skin.
• Cover with a sterile, non‑adherent dressing (e.g., gauze soaked in saline).
• Take an over‑the‑counter analgesic such as acetaminophen or ibuprofen, unless contraindicated.
• Avoid home remedies like butter, oils, or toothpaste, which can trap heat and increase infection risk.

2. Medical Management (Professional Care)

• Fluid Resuscitation – For burns >20% TBSA, the Parkland formula (4 mL × body weight kg × %TBSA) is used to guide crystalloid administration during the first 24 hours.
• Pain Control – IV opioids, patient‑controlled analgesia, or regional blocks for severe pain.
• Wound Care
  • Debridement of devitalized tissue (sharp, enzymatic, or mechanical).
  • Application of topical antimicrobial agents (e.g., silver sulfadiazine, mafenide acetate) for partial‑thickness burns.
  • Silicone dressings or hydrocolloids for dressing changes that promote a moist healing environment.
• Infection Prevention – Tetanus prophylaxis if immunization status is uncertain; systemic antibiotics only when infection is proven or highly suspected.
• Surgical Intervention
  • Early excision and autografting for deep partial‑thickness and full‑thickness burns.
  • Skin substitutes (e.g., Biobrane, Integra) when donor sites are limited.
• Inhalation Injury Management – Endotracheal intubation if airway compromise is imminent, bronchoscopy, humidified oxygen, and aggressive pulmonary hygiene.
• Rehabilitation – Physical therapy to maintain range of motion, prevent contractures, and strengthen surrounding musculature.

3. Long‑Term Care

• Scar management: silicone gel sheets, pressure garments, and scar massage.
• Psychological support: counseling for PTSD, anxiety, or depression that may follow severe burns.
• Regular follow‑up with a burn specialist or dermatologist for early detection of hypertrophic scarring or contracture formation.

Prevention Tips

Most burns are preventable with simple safety measures:

• Kitchen safety – Keep pot handles turned inward, use back burners, and test water temperature before bathing children.
• Fire safety – Install smoke detectors, maintain fire extinguishers, and develop a family escape plan.
• Electrical safety – Avoid overloading outlets, use ground‑fault circuit interrupters (GFCIs), and keep cords away from water.
• Chemical safety – Store acids, alkalis, and solvents in locked cabinets; wear gloves and eye protection when handling them.
• Sun protection – Apply broad‑spectrum SPF 30+ sunscreen, wear hats and protective clothing, and avoid peak UV hours.
• Workplace protection – Follow occupational safety guidelines, wear appropriate PPE (gloves, flame‑resistant clothing), and receive regular safety training.
• Child supervision – Keep hot liquids out of reach, never leave a child alone in the bathroom, and use stove guards.
• Cold injury prevention – Handle liquid nitrogen or dry ice with insulated gloves, and never apply ice directly to skin for prolonged periods.

Emergency Warning Signs

Key Take‑aways

Burn injuries range from minor superficial scalds to life‑threatening full‑thickness wounds. Understanding the cause, recognizing associated symptoms, and knowing when to seek professional care are essential for a good outcome. Prompt first aid, appropriate medical treatment, and diligent prevention can dramatically reduce the physical and emotional burden of burns.

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References:

1. Mayo Clinic. Burns. https://www.mayoclinic.org/diseases-conditions/burns/symptoms-causes/syc-20370503 (accessed May 2026).
2. Cleveland Clinic. When to Seek Care for a Burn. https://my.clevelandclinic.org/health/diseases/15141-burns (accessed May 2026).
3. American Burn Association. Guidelines for Burn Care. https://ameriburn.org/resources/clinical-practice-guidelines/ (2023).
4. World Health Organization. Prevention of Burns. https://www.who.int/health-topics/burns (accessed May 2026).
5. National Institutes of Health, National Library of Medicine. Burns: First Aid. https://medlineplus.gov/burns.html (accessed May 2026).

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