“If you reach the point where youre actually thirsty, youre already dehydrated.”

John Schumann, the Oklahoma-based executive medical director of Oak Street Health.

Martin Huecker, an emergency care doctor at UofL Health in Louisville, Kentucky.

A person holding a water bottle, wiping their forehead with their forearm, appearing exhausted or overheated outdoors

The vital signs change.

The heart rate and blood pressure start to change.

You should immediately call 911 if you notice confusion in someone who has been out in the heat.

Phone screen showing Los Angeles weather: 96°F, feels like 100°F, clear skies, 4 mph wind. Map of Boyle Heights area displayed

Below, experts share what theyd avoid doing on hot days when keeping safety in mind.

They wouldnt just look at the air temperature.

When extreme temperatures are in town, you shouldnt assume theyre no big deal.

Person with a ponytail pouring water over their head from a plastic bottle under a clear sky

Instead, you should plan ahead and be aware of the weather forecast, Huecker said.

Some days the temperature isnt telling the whole story.

They wouldnt let themselves get thirsty.

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If you reach the point where youre actually thirsty, youre already dehydrated, said Schumann.

You should be hydrating enough so that youre not getting thirsty.

But thats not the only thing your body might need.

A woman adjusts a fan in a kitchen, with a laptop open on the counter. The kitchen has a bright and airy atmosphere with greenery visible outside

If you are sweating a lot, you lose more than just water, Huecker said.

Youre losing sodium, potassium, chloride, magnesium.

Brands likeLMNT,Liquid I.V.andPedialytesell electrolyte powders and drinks.

Person shielding their face from the sun with their hand, eyes closed, appearing relaxed and serene. No names are available

You dont have to get real fancy and spend a bunch of money.

They wouldnt use alcohol to quench their thirst.

Moderation is going to be the key.

A person is spraying sunscreen onto their arm outdoors, focusing on skincare and sun protection

If youre someone who likes to drink, it can be refreshing.

But when its this hot out … alcohol will dehydrate you faster than you otherwise would, Schumann said.

If you could avoid drinking, [thats] so much better.

A woman applies skincare product to her face while looking in a mirror. She is wearing a tank top and has her hair in a bun

And stay with something thats going to keep you hydrated.

They wouldnt stay outside at the hottest time of day.

They wouldnt remain in the sun without taking breaks.

A person with a ponytail sits, shielding their eyes from sunlight with one hand and holding a glass of water in the other

They wouldnt forget bug and pest concerns.

you oughta keep more than just sun safety in mind.

And the same goes for mosquitoes.

Many people tend to go swimming on hot days, but these insects often linger around bodies of water.

They wouldnt skip sunblock.

When its hot outside, Schumann said he wearssunscreenand a hat to avoid sunburns.

They wouldnt ignore how certain medications react to heat and sun.

Some antibiotics can make people more sun-sensitive, where theyll burn more easily, maybe even get a rash.

Some diuretics will do it.

Some nonsteroidal anti-inflammatory agents will do it things like ibuprofen.

And some hormones will do it.

I would just be smart about it.This article originally appeared onHuffPost.