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It’s easy to assume that you’ve got your hydration needs covered when you tote a water bottle around with you all day. But there’s a big difference between having water on-hand and drinking enough to meet your body’s needs.

The signs of dehydration can be subtle, making it important to at least be aware of them. After all, not being hydrated enough can have a big impact on your health—and no one is off-limits. “Anyone can suffer from dehydration, but certain people are more likely to have problems from it,” says Nicole McAllister, D.O., an emergency room physician at The Ohio State University Wexner Medical Center.

Older adults and young people are especially vulnerable, she says, but hot weather and being active raise the risk of dehydration, too. “When we are sick with vomiting or diarrhea, we are also at increased risk of dehydration,” Dr. McAllister says. Even certain medications like antihistamines raise your risk of dehydration, she says. Basically, there are a lot of elements that can work against your goal to stay hydrated.

Not sure where things stand for you on the hydration spectrum? These are subtle signs of dehydration to keep in mind, according to doctors. While minor dehydration can typically be turned around by drinking more water, doctors point out that sometimes medical intervention is needed. Here’s what you need to keep in mind.

Signs of dehydration

These are some of the most common signs of dehydration, according to doctors.

1. You’re thirsty.

“Usually when thirst occurs, the person is about 2% dehydrated,” says Michael Seth Smith, M.D., a sports medicine physician at the Florida Orthopaedic Institute in Gainesville, FL. That means you don’t have to sprint to a water fountain immediately, but you should grab a glass of water soon. If you don’t listen to your body’s signals, you’ll slowly become more dehydrated, especially if you’re engaging in physical activity.

2. You have dry mouth.

Dry mouth is another way your body tells you it needs more total body water, per the National Library of Medicine. Your body can’t make sufficient saliva if it doesn’t have enough fluids. Watch out for bad breath, too, which can be caused by dry mouth. Grab a bottle of water before a piece of gum, because the culprit is often mild dehydration.

3. Your urine looks like tea.

The more total body water you have, the clearer your urine will be. If it’s a darker color, that means it’s more concentrated, and it’s a sign you should drink more water.

4. You’re peeing less than usual.

Water helps your kidneys remove waste from your blood in the form of urine. If your kidneys aren’t getting enough water to carry waste from your body, you simply won’t urinate as frequently. Instead, you’ll keep that waste in your body, and if you’re chronically dehydrated, it can cause more serious problems over time. When urine is too concentrated, waste minerals can stick together to create kidney stones, per the Mayo Clinic.

It’s not just your renal system that depends on water to function properly—just about every major system in your body does, including your heart, brain, and lungs, Dr. Smith says.

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