Dehydration occurs when more water and fluids leave the body than enter it. Even low levels of dehydration can cause headaches, lethargy, and constipation.
The human body is roughly 75 percent water. Without this water, it cannot survive. Water is found inside cells, within blood vessels, and between cells.

A sophisticated water management system keeps our water levels balanced, and our thirst mechanism tells us when we need to increase fluid intake.

Although water is constantly lost throughout the day as we breathe, sweat, urinate, and defecate, we can replenish the water in our body by drinking fluids. The body can also move water around to areas where it is needed most if dehydration begins to occur.

Most occurrences of dehydration can be easily reversed by increasing fluid intake, but severe cases of dehydration require immediate medical attention.

Fast facts about dehydration
*Around three-quarters of the human body is water.
*The causes of dehydration include diarrhea, vomiting, and sweating.
*Individuals more at risk of dehydration include athletes, people at higher altitudes, and older adults.
*Early symptoms of dehydration include dry mouth, lethargy, and dizziness.

Treatments
Dehydration must be treated by replenishing the fluid level in the body. This can be done by consuming clear fluids such as water, clear broths, frozen water or ice pops, or sports drinks (such as Gatorade). Some dehydration patients, however, will require intravenous fluids in order to rehydrate. People who are dehydrated should avoid drinks containing caffeine such as coffee, tea, and sodas.

Underlying conditions that are causing dehydration should also be treated with the appropriate medication. This may include anti-diarrhea medicines, anti-emetics (stop vomiting), and anti-fever medicines.
Reference: https://www.medicalnewstoday.com/articles/153363.php

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