We do not endorse non-Cleveland Clinic products or services. Overheating is one of the biggest causes of dehydration. When you exercise, your muscles generate heat. To keep from burning up, your body needs to get rid of that heat. The main way the body discards heat in warm weather is through sweat. As sweat evaporates, it cools the tissues beneath.
According to the American College of Sports Medicine, to avoid dehydration, active people should drink at least 16 to 20 ounces of fluid one to two hours before an outdoor activity.
After that, you should consume 6 to 12 ounces of fluid every 10 to 15 minutes that you are outside. When you are finished with the activity, you should drink more. How much more? To replace what you have lost: at least another 16 to 24 ounces 2 to 3 cups. In this post, we will go over the many possible causes for drinking ample quantities of water but still feeling thirsty.
If your thirst seems greater than it should be and persists even after a tall glass of water, there may be an underlying medical situation. If you have diabetes insipidus, for example, your body may be producing large amounts of urine, especially in people who also have high blood pressure.
Complications from diabetes insipidus include dehydration and a change in the chemical composition of body fluid from electrolyte imbalance related to blood sugar levels. Vomiting and diarrhea can also cause loss of water in the body.
That is because expelling too much fluid in this way disrupts the normal electrolyte balance of your body. In addition to waking up parched at night , you may experience dizziness and fatigue from your dehydrated state. For example, heart failure inhibits adequate blood flow, which leads to reduced blood volume that induces a feeling of thirst. Kidney failure can also cause you to experience excessive thirst, because your kidneys are not maintaining a balance of bodily fluids, according to the U.
National Library of Medicine. Blood vessels in the esophagus can become enlarged and bleed with certain liver problems, decreasing blood volume which also leads to a body fluid imbalance. In addition, there is a mental health condition called polydipsia characterized by extreme thirst induced by stress and anxiety.
People who live in dry climates or high altitude can attest to needing to drink more water than those who don't live in those areas. It's crucial that they understand the importance of electrolytes at altitude. The kidneys function to regulate body fluid volume, and the food you eat can increase sodium concentrations in your blood relative to water. The interstitial fluid water around cells moves into and out of your bloodstream to balance changes in sodium and water content according to Current Biology.
Auerbach PS, et al. Dehydration and rehydration. In: Auerbach's Wilderness Medicine. Philadelphia, Pa. Accessed July 19, Dietary Reference Intakes for electrolytes and water. National Academies of Sciences, Engineering, and Medicine. Centers for Disease Control and Prevention. Hydration: Why it's so important.
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Treatment and outlook will depend on the diagnosis. To remain healthy, you need to drink fluid regularly throughout the day. You can increase your water intake by eating water-rich foods , such as:. If you fail to replenish the fluids you lose and fail to respond to your thirst by drinking fluids, you can become dehydrated. Taking in more water than you expel is called overhydration. This can occur when you drink too much liquid to compensate for fluid loss.
It can also occur if you have disorders in the kidney, liver, or heart. Overhydration can cause a severely low blood sodium level that could result in confusion and seizures, especially if it develops quickly. In normal circumstances, you should be able to quench your thirst fairly quickly. However, if your urge to drink remains constant, or does not go away after you drink, it may be a sign of a serious health problem, especially if combined with other symptoms.
This constant urge to drink could also be a psychological problem. One of the hallmark signs of diabetes is excessive thirst and urination.
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