The UK is very hot now. It might get to 40°C. People should be careful.

We need to drink water when it's hot. If we sweat, we need to drink more.

How do we know if we are dehydrated or just thirsty?

A specialist says there are signs to look out for to see if we are dehydrated.

We need water when it's hot.

It's not easy to know if we are dehydrated. The signs are not clear.

A specialist said dehydration signs are not always clear. They can be a headache.

If we are tired or have a headache in hot weather, we might need water.

If we want salty or sweet food, we might be dehydrated.

When we don't have enough water, our body might feel hungry.

Bad breath can be a sign of dehydration. Our mouth needs water to be clean.

If we don't drink water, our mouth can smell bad.

Thirst means we are already dehydrated.

We should drink water all day to not get dehydrated.

Drinking water in the morning and at night is very good.

Water in the morning helps after a hot night. Water at night helps our body temperature.

We need to drink water all day.

We should drink 6-8 glasses of water a day, but more when it's hot.

If our urine is not pale yellow, we need to drink more water.