Being stung by a jellyfish.
cause
Usually the main cause of burning is dryness and/or allergies.
The depth of water in a swimming pool should always be examined before jumping into it because you can cause injury to yourself (and in some cases, others) if the water is too shallow. For a person of average size, 9-12 feet is suitable for jumping into, as there is plenty of room to submerge and surface safely. Anything too shallow- about 6 feet and under- could cause injury to the jumper- generally impact injuries that could break bones or crack skulls, depending on how you jump in and how deep or shallow the water is. Also, always make sure there is no one too close or beneath you before diving, for you could cause serious injury to yourself and them.
Repeated motion of a joint, such as during swimming, can cause tendonitis. See related link.
oxygen and moisture
Probably a needle because a gun is more likely to cause an infection and it's better if a needle is used.
cause its cool like that cause its cool like that
There are many situations that can cause burning or itching eyes. Examples of situations that can cause burning or itching eyes include working with chemicals or being around gases.
Yes.
Yes. Don't worry, swimming is the only exercise where lack of oxygen will cause you to black out
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Cutting too often, mostly. Excess moisture can also cause a shallow root system.