8 Things that Will Dehydrate You Fast

Taking diuretics 

People with high blood pressure probably take diuretics or “water pills” that lower blood pressure, helping the body excrete sodium, but you will also lose water by urinating frequently. 

“When you become dehydrated, you lose fluid, which makes the blood thicker. The result is that it’s more difficult for your heart to pump blood out to your extremities,” said Goodson. 

In addition, if you suffer from hypertension try to avoid hot and humid environments, because they could adversely affect your health. You should talk to your doctor about your treatment and how it affects hydration.