Dehydration is more serious than just feeling thirsty. It can be seriously harmful to your health. Understanding the symptoms and risks of dehydration can help avoid its dangerous later stages.

Eric R. Goldberg, MD, clinical associate professor of medicine and medical director of NYU Langone Internal Medicine Associates, speaks with Health magazine about these symtptoms and complications that can come with severe dehydration. The more mild symptoms include bad breath, dry skin, and irritability, while more serious symptoms are constant headaches, chills, and constipation. Low blood pressure is another severe symptom that should be taken very seriously.

“While not drinking enough water can cause a plethora of symptoms, one in particular, low blood pressure, can be especially dangerous,” says Dr. Goldberg. “Low blood pressure can be especially dangerous, as it means your blood isn’t getting properly sent to critical organs, including your brain.”

While the consequences of dehydration are serious, the solution is a simple one. Most people can fix the problem by simply drinking water when they are thirsty.

Read more from Health.