The planet is getting hotter fast. This is what happens to your body in extreme heat
Human-caused climate change has already made heat waves around the world more frequent and intense. Scientists who study the role of global warming on weather say that every heat wave today bears the fingerprints of the climate crisis. Climate change, driven primarily by humans burning fossil fuels, is worsening global extreme weather in general, but much of that change is related to heat. In the US, heat kills more Americans than any other weather-related disaster, and it will only continue to worsen as the world heats up from burning fossil fuels. Heres what happens to your body in extreme heat, what you need to watch out for and how to stay safe. Normally, your body is used to a certain range of temperatures, usually between 97 to 99 degrees Fahrenheit. When your brain senses a change either lower or higher than that it attempts to help your body cool down or heat up, according to Dr. Judith Linden, executive vice chair of the department of emergency medicine at Boston Medical Center and a professor in the emergency medicine department at Boston Universitys school of medicine. There are a number of different ways in which (the brain) attempts to cool the body down. One way, the most common way we think of, is that you sweat, Linden said. The pores open, the body sweats and the sweat evaporates, that cools the body. The second way your body cools itself down is by dilating vessels and upping your heart rate, which helps bring heat and blood to the surface of your body and helps releases that excess heat. When youre exposed to high temperatures, it becomes harder for your body to try and keep up with cooling itself down. And if your environment is hot and humid, sweat doesnt evaporate as easily which pushes your bodys temperature even higher, according to the Mayo Clinic. The higher the humidity, the lower temperatures you need for extreme heat, Linden said. High body temperatures can lead to damage to the brain and other vital organs, the CDC says. They can also lead to several heat-related illnesses. Mild-heat related illnesses, including heat cramps, are most common, Linden said. Heat cramps can develop in people who sweat a lot, including during exercising. The excessive sweating uses up all of the bodys salt and moisture and can lead to muscle pains or spasms, usually in the abdomen, arms or legs, according to the CDC. A heat rash can also develop. Thats a skin irritation caused by too much sweating in hot and humid weather, and is most common in young children, the CDC says. It is usually a red cluster of pimples or blisters, and tends to be in places including the neck, upper chest or in elbow creases. When your bodys beginning to exceed its ability to cool itself down, you can develop whats known as heat exhaustion. In this case youre going to see excessive sweating because your body is really going to try and keep up with that extra heat. Youre going to feel light-headed, you may feel dizzy, often people present with nausea, headaches and their skin often looks pale and clammy and their pulse is often fast, Linden said. This is the bodys last attempt to cool itself before it really goes into a point of no return. A heat stroke is the most serious heat-related illness, and, if left untreated, can lead to death. Thats where your bodys temperature goes above 104 to 105 degrees or so, and this is where your mechanisms are starting to fail, Linden said. Warning signs may include extremely high body temperatures, red and dry skin, a rapid pulse, headache, dizziness, nausea or loss of consciousness, according to the CDC. The hallmark of a heat stroke is confusion and agitation, Linden said. So when somebodys in the heat and they become confused and agitated, thats heat stroke until proven otherwise and you need to call 911 for that or get help immediately and get the person out of the heat. Elderly, people with chronic medical conditions as well as children are at higher risk for severe heat-related illnesses. The elderly and people with chronic medical conditions may be less likely to sense and respond to temperature changes and may be taking medication that make the heat effects worse, the CDC said. Very young (people) as well, because theyre less likely to recognize heat-related illness and theyre less likely to get out of the heat if theyre starting to feel overheated, Linden said. Student-athletes and pets are also at higher risk, she added. In this weather, you must never, ever, ever leave a child or a pet in the car for even a minute, Linden added. When your community is facing extreme heat, there are several things you can do to keep yourself and others safe. First, keep an eye out for symptoms of heat exhaustion or other illnesses. If somebody starts feeling light-headed, dizzy, nausea or headache, that is the time to act immediately, Linden said. That means getting them out of the heat and into a cool environment. Putting water on someone who may be experiencing symptoms and giving them fluids can help cool them down. If someone is starting to lose consciousness or has nausea or vomiting, call 911. If you see anybody with any type of confusion, thats an immediate red flag, Linden added. When its hot outside, try to avoid outdoor activities especially between the hours of 11 a.m. and 3 p.m., according to Linden. If you have to go outside, wear light-colored clothing, cover your head and drink plenty of fluids. Dont wait until youre thirsty to drink water as that can be a sign of dehydration. Linden recommends drinking at least one glass of water or more an hour. If you do start to feel light-headed, dizzy, sweating, fast pulse, get out of the heat immediately, Linden said. Try to find air conditioning, or places in your area where you can go to stay cool, according to Ready.gov. Even spending a few hours in a shopping mall or public library can help. When youre home, fans can help, but dont rely on them as your only way of cooling down while it may feel more comfortable, they wont help prevent heat-related illness. If youre in a super hot room, if youve got a fan, is it helpful? No. I think, if youve got a fan, and youre able to mist yourself ... then fans can be helpful, Linden said. Fans are not foolproof. Finally, make sure youre checking on your neighbors, parents and friends especially older individuals who may be living alone or are isolated, Linden said.