When the weather is hot, it’s easy to brush off symptoms like feeling tired, dizzy or sick to your stomach. But sometimes, those signs are your body’s way of saying it’s struggling with the heat.

Heat illnesses can come on faster than many people realize and may affect anyone. Older adults, young children, people with chronic health conditions and even healthy adults are all at risk. Whether you’re gardening, running or enjoying a summer event, too much heat can put stress on your body and knowing the early signs of heat illnesses can help you cool down and avoid a more serious emergency.

Watch for these signs and take action if you see them to avoid a dangerous situation.