Burns are tissue damage that results from heat, overexposure to the sun or other radiation, or chemical or electrical contact. Burns can be minor medical problems or life-threatening emergencies.

The treatment of burns depends on the location and severity of the damage. Sunburns and small scalds can usually be treated at home. Deep or widespread burns need immediate medical attention. Some people need treatment at specialized burn centers and monthslong follow-up care.

Symptoms

Burn symptoms vary depending on how deep the skin damage is. It can take a day or two for the signs and symptoms of a severe burn to develop.

  • 1st-degree burn. This minor burn affects only the outer layer of the skin (epidermis). It may cause redness and pain.
  • 2nd-degree burn. This type of burn affects both the epidermis and the second layer of skin (dermis). It may cause swelling and red, white or splotchy skin. Blisters may develop, and pain can be severe. Deep second-degree burns can cause scarring.
  • 3rd-degree burn. This burn reaches to the fat layer beneath the skin. Burned areas may be black, brown or white. The skin may look leathery. Third-degree burns can destroy nerves, causing numbness.

Causes

Burns are caused by:

  • Fire
  • Hot liquid or steam
  • Hot metal, glass or other objects
  • Electrical currents
  • Radiation, such as that from X-rays
  • Sunlight or other sources of ultraviolet radiation, such as a tanning bed
  • Chemicals such as strong acids, lye, paint thinner or gasoline
  • Abuse

Complications

Complications of deep or widespread burns can include:

  • Bacterial infection, which may lead to a bloodstream infection (sepsis)
  • Fluid loss, including low blood volume (hypovolemia)
  • Dangerously low body temperature (hypothermia)
  • Breathing problems from the intake of hot air or smoke
  • Scars or ridged areas caused by an overgrowth of scar tissue (keloids)
  • Bone and joint problems, such as when scar tissue causes the shortening and tightening of skin, muscles or tendons (contractures)