

Burns are probably the most painful of common injuries. The burn damages or exposes sensitive nerve endings, causing intense pain signals to be sent to the brain. This pain can persist until the skin is fully healed. Burns often leave scarring which can be thick and inflexible, causing restricted movement and disfigurement.
Severe burns can penetrate below the skin, causing damage to muscles, nerves and blood vessels. There can also be long-term emotional problems.
The severity of a burn injury is assessed by two factors. Extent measures the percentage of the body surface covered (15% is commonly regarded as the threshold between relatively minor and more severe burns). Degree indicates the depth of skin loss or damage.
First degree burns (superficial burns) affect only the top layer of skin. They cause reddening of the skin but can still be extremely painful.
Second degree burns are when the top layer of skin is destroyed and the lower dermal layer is exposed and damaged.
Third degree burns (full thickness burns) mean the entire depth of skin has been affected and the flesh below is exposed and possibly damaged. Muscles, bone and nerves may be affected. Recovery may require skin grafts and take many months, or even years of treatment.