I popped ibuprofen for afternoon headaches for months before a doctor asked how much water I drank. Not much, as it turned out. One coffee in the morning, maybe a glass of water with lunch, and then nothing until dinner. She told me that dehydration headaches are some of the most misdiagnosed pain people deal with — because they feel like regular tension headaches and the fix is not a pill.

The Quick Self-Test

Pinch the skin on the back of your hand. If it snaps back immediately, you are probably hydrated. If it takes a second or stays tented, you are dehydrated. This is called the skin turgor test and it is surprisingly reliable.

Another sign: check your urine color. Pale yellow is good. Dark yellow or amber means you need water, now. If it is completely clear, you might actually be over-hydrated, which can flush out electrolytes and cause its own kind of headache.

Dehydration Headache Symptoms

The pain is usually dull and all over — not a sharp stabbing in one spot. It gets worse when you move your head, bend over, or walk up stairs. Sound familiar? That throbbing when you stand up too fast is your brain literally shrinking slightly from fluid loss, pulling on the membranes that attach it to your skull.

Do Not Just Chug Water

Gulping a liter of water at once will mostly go straight to your bladder. Sip slowly over 30 minutes for better absorption. If plain water does not help within an hour, try something with electrolytes — a sports drink, coconut water, or a pinch of salt and sugar in your water. Sometimes the issue is not just fluid loss but electrolyte imbalance.