The outdoors is a place for work, leisure, travel, and fun in all sorts of climates, weather, and conditions. Heat and cold may both have adverse consequences, and critters that live outside (or are supposed to) sometimes cause irritation or injury. Lack of proper hydration or altitude and other outdoor conditions may also cause you to feel poorly. No matter what you are doing outside, it's crucial to be aware of how to care for or give aid to people with injuries and illnesses that may result.