Doctors say people can experience specific medical issues if they do not drink enough water and stay hydrated.

Most people need at least 11 cups of water a day that can come in the form of juices and vegetables. However, people with certain conditions, such as late-stage kidney disease might need to limit their water intake.

Doctors say every time a person sweats or uses the bathroom, they lose water, which is why replenishing it can be critical to their health. They add that people can suffer from dehydration all year, not only when it's hot.

Putting stress on the heart along with dehydration can contribute to kidney stones, urinary tract infections and can cause blood sugar levels to spike.

"When you get really dehydrated, the blood volume is lower, and that's going to lead your heart to have to beat faster to circulate enough oxygen to your body," says Dr. Glenn Hirsch, chief of cardiology at National Jewish Health.

Dehydration can also trigger headaches and brain fog. When a person is dehydrated, their brain tends to shrink away from their skull, which activates pain receptors and makes it harder to think and remember clearly.

Water is also needed to keep a normal body temperature, lubricate and cushion joints and protect the spinal cord and other sensitive tissues.

Hirsch suggests people start drinking water at least three hours before they are in the sun, on their feet or are involved in an activity. They should also take sips throughout the day.

It's also recommended that people limit alcohol and caffeine because they increase fluid loss.

Hirsch says people should also replenish electrolytes.

"That can be by eating salty food like chips or electrolyte drinks, or even some of those supplements you can put into your water, because at some point, if you're only drinking pure water and you're sweating a lot, your sodium level is going to drop and that can actually be dangerous," he says.