Stepping outside on a July or August day can feel like a physical blow. The longer you spend in the heat, the more serious the effects on your body can be.
First, increased body temperature can start to cause heavy sweating, clammy skin, dehydration, tiredness, headache, dizziness, nausea, cramps, and a quick, weak pulse.
Someone in this state should move to cool place, sip water, and take a cool bath or put cool wet cloths on their body. If these symptoms last longer than an hour, worsen, or if a person is vomiting, then they need medical help, according to the CDC.