What causes dehydration?

Dehydration may be caused by not drinking enough water, losing too much fluid or both. Any of the following may increase your chance of having dehydration:

  • advanced age with decreased ability to sense thirst or to concentrate urine
  • being in the sun or heat for too long, or sweating a lot, such as when you exercise
  • diseases, such as stroke, diabetes, heart problems or infections
  • medicines that cause you to lose water and salt, such as diuretics (water pills)
  • vomiting, diarrhea or fever that lasts a long time

Continue Learning about Water & The Body

Why is fluid intake important?
Grant Cooper, MDGrant Cooper, MD
Fluids are essential to the proper functioning of the body. Body mass is made up of about 60 percent...
More Answers
Is it better to drink warm or cold water during exercise?
National Academy of Sports MedicineNational Academy of Sports Medicine
Research indicates that drinking a cool beverage during exercise may help a little bit with cool...
More Answers
Does drinking water cause bloating?
Alberto Gamboa , NASM Elite TrainerAlberto Gamboa , NASM Elite Trainer
Myths about water retention Many people think that drinking too much water will make them bloated...
More Answers
Why do I need to stay hydrated while swimming?
Academy of Nutrition and DieteticsAcademy of Nutrition and Dietetics
Remaining hydrated during the hot summer months is very important. One of your body's best remin...
More Answers

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.