By: Dr. Alidad Zadeh, D.O.

Every summer, patients come to my office for something that seems unrelated — a headache that won’t quit, dizziness on standing, cramping legs, a grandmother who suddenly seems confused. Often the answer is simple: they didn’t drink enough water.

Dehydration means your body has lost more fluid than it has taken in. That sounds minor. It isn’t. Water carries nutrients, cushions your joints, cools your body, and keeps your blood pressure and kidneys working. When it runs low, all of those systems start to fail at once.

Know the early signs

Thirst is a late signal, not an early one. By the time you feel thirsty, you are already behind. Watch instead for:

• Dark yellow urine, or going to the bathroom less than usual
• Dry mouth and cracked lips
• Headache
• Fatigue or trouble concentrating
• Feeling lightheaded when you stand up
• Muscle cramps

In babies, look for fewer wet diapers, no tears when crying, and a sunken soft spot on the head. In older adults, confusion or a sudden change in behavior is often the first sign — the sense of thirst fades with age, so a person can be seriously dehydrated and never once ask for water.

Why it matters

Untreated dehydration is not just discomfort. It leads to heat exhaustion, which can progress to heat stroke — a true emergency that can kill within hours. It causes kidney stones and, in severe cases, acute kidney injury. It drops blood pressure, which causes falls and broken hips in the elderly. It worsens control of diabetes and heart disease and sends people to the hospital. It also thickens the blood, which raises the risk of clots.

Who is at highest risk?

Field and construction workers. Athletes. Young children. Anyone over 65. People on water pills or blood pressure medication. Anyone with vomiting, diarrhea, or fever. And anyone drinking alcohol in the heat — alcohol pulls fluid out of you at the worst possible time.

How to prevent it

• Drink on a schedule, not on thirst. Most adults need roughly eight to twelve cups a day, and considerably more in heat or with physical work.
• Check your urine color. Pale straw is the target. Dark means drink more.
• Working outside? About one cup every fifteen to twenty minutes. Past an hour of heavy sweating, add an electrolyte drink — water alone isn’t enough when you’re losing that much salt.
• Eat your water. Watermelon, oranges, cucumbers, and soups all count.
• Move outdoor work to early morning or evening when you can.
• Hydrate before, during, and after — not just after.
• Check on elderly neighbors and relatives during heat waves. Bring water and stay a minute.

When to seek care

Go to a doctor or emergency room if you cannot keep liquids down, if diarrhea lasts more than a day, if you haven’t urinated in eight hours, or if you feel faint. Confusion, a racing heart, hot, dry skin, or fainting in the heat — call 911 immediately. Heat stroke is not something to sleep off.

Dehydration is one of the few serious medical problems you can prevent entirely, for free. Fill the glass before you feel like you need it.

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