Hi Dehydration happens whenever you lose more water than you’re taking in. Sometimes you may just forget to drink enough water. Most of the time, though, dehydration happens when you exercise vigorously and fail to replenish the water lost through sweat. On very hot days, especially when it’s hot and humid, you can lose a significant amount of water through sweat. Dehydration is also a common side effect of many prescription and over-the-counter (OTC) medications. The human body relies on water to perform its most critical functions, so having too little of it can be very dangerous. When it’s severe, dehydration can cause brain damage and death. Severe dehydration is more common in: children older adults people with chronic illnesses people who don’t have access to safe drinking water But it only takes a mild case of dehydration to cause a dehydration headache. Dehydration headche remedies are Drink water First, get a drink of water as soon as possible. Most dehydration headaches resolve within three hours of drinking. You don’t need to overhydrate: A simple glass or two of water should help in most cases. Drinking too quickly sometimes makes dehydrated people vomit, so it’s best to take slow, steady sips. You could even suck on a few ice cubes. Electrolyte drinks While plain water should do the trick, drinks like Pedialyte and Powerade give an extra boost with electrolytes. Electrolytes are minerals your body requires to function. You get them from the foods you eat and things you drink. Dehydration can disrupt the important balance of electrolytes in your body, so replenishing them with a low-sugar sports drink might help you feel better. Regards DR DE