The first heat wave of 2025 arrives in Northern California on Friday.

Those sensitive to heat or who spend extended amounts of time outdoors could be susceptible to heat-related illnesses.

According to the Centers for Disease Control and Prevention , there are several kinds of heat-related illnesses to watch out for. Here's info about them and what to do if you experience symptoms:

Heat cramps

These can arise when you exert yourself outside on a hot day

Noticeably tired/crampy. You could have muscle pain or spasms.

What to do: Head to a cool area, get hydrated with water or a sports drink and take it easy the rest of the day. Get medical help if your cramps last more than an hour, you're on a low-sodium diet or have heart problems.

Heat exhaustion

A fast, weak heart rate

Profuse

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