First aid (wilderness first aid in particular) can help a person survive and function with injuries and illnesses that would otherwise kill or incapacitate him/her. Common and dangerous injuries include:

* Lacerations, which may become infected
* Bites or stings from venomous animals, such as: snakes, scorpions, spiders, bees, stingrays, jellyfish, catfish, stargazers, etc.
* Bites leading to disease/septicemia, such as: mosquitoes, fleas, ticks, animals infected with rabies, sand flies, komodo dragons, crocodilians, etc.
* Infection through food, animal contact, or drinking non-potable water
* Bone fractures
* Sprains, particularly of the ankle
* Burns
* Poisoning from consumption of, or contact with, poisonous plants or poisonous fungi.
* Hypothermia (too cold) and hyperthermia (too hot)
* Heart attack
* Hemorrage

The survivor may need to apply the contents of a first aid kit or, if possessing the required knowledge, naturally-occurring medicinal plants, immobilize injured limbs, or even transport incapacitated comrades.