Can Dehydration Cause Fast Heart Rate?

We’ve all experienced the feeling of dehydration at some point: dry mouth, dizziness, fatigue, and maybe even a headache. But did you know that severe dehydration can actually cause more serious risks to your health–like an increase in heart rate? It’s true; research shows that when our bodies become incredibly dehydrated, it can lead to spikes in our heart rate.

Are you feeling extra exhausted lately, coupled with a racing heart? It’s possible you’ve become dehydrated. Dehydration can cause an abnormally fast or irregular heartbeat and is generally easier (and safer) to treat than other causes of rapid heart rate.

Today, we’ll explore the connection between dehydration and fast heart rate in more detail to help you better understand what’s happening in your body and how best to address the issue at hand.

What is dehydration?

At its core, dehydration is a condition that happens when the body doesn’t have enough water or fluid to function properly. It’s important to note that dehydration isn’t simply caused by not drinking enough water—you can become dehydrated due to sweating from exercise, illness such as diarrhea and vomiting, and exposure to heat (especially in hot summer months).

What are the symptoms?

1. Dry Mouth

2. Dizziness

3. Fatigue

4. Headache

5. Increase in heart rate

6. Abnormally fast or irregular heartbeat

7. Difficulty concentrating

8. Low blood pressure (causing lightheadedness)

What causes dehydration and a fast heart rate?

Most of the time, dehydration is caused by a lack of water intake. When you don’t drink enough fluids or your kidneys can’t keep up with what you are losing in sweat, urine, and normal bodily functions, it leads to dehydration. This can cause an increase in heart rate due to the body trying to create more blood volume to send oxygen and nutrients to cells. To try and make up for the lack of fluid, your body will start to pump faster so it can carry more oxygen around in your blood.

In addition to a lack of hydration, there are other factors that may contribute to dehydration like prolonged exercise without proper water intake or an illness such as the stomach flu or food poisoning. Both of these can cause vomiting and diarrhea which will quickly lead to dehydration. Additionally, exposure to extreme heat can also cause you to become dehydrated as your body has difficulty cooling itself down in hot environments.

What are some of the risks associated with dehydration?

1. If you become severely dehydrated, your blood pressure can drop significantly and result in a fast heart rate. This is because your body is trying to increase the volume of oxygenated blood that it pumps around your body, as there’s less fluid available for transportation.

2. Dehydration can also cause electrolyte imbalances, which can lead to serious complications. Electrolytes are minerals in your body that help regulate your heart rate and blood pressure. When they become imbalanced due to dehydration, it can cause a rapid heartbeat, arrhythmia, or even cardiac arrest.

3. Dehydration can also lead to heat exhaustion or heat stroke in extreme cases. Heat exhaustion is a result of your body overheating and not being able to cool down properly. If it progresses to heat stroke, you may experience confusion, dizziness, nausea, and even seizures.

4. Finally, if left untreated for too long dehydration can eventually lead to organ failure or death in extreme cases.

How can you prevent dehydration from occurring?

1. Start by drinking water throughout the day and make sure you’re getting adequate hydration. If you’re going to be outside in the summer, carry a reusable bottle of cold water with you for easy sipping.

2. Avoid sugary drinks which can actually dehydrate your body due to their high sugar content.

3. If you’re going to be exercising, make sure you drink water before, during, and after your workout.

4. Wear loose, breathable clothing when out in hot weather or when exercising. This will help keep your body cool and reduce the risk of dehydration occurring due to sweating.

5. Consider taking electrolyte supplements before and after exercise. Electrolytes like sodium, potassium, and magnesium are important for regulating your body’s fluid balance and preventing dehydration.

6. If you start to feel any of the signs or symptoms associated with dehydration, such as dizziness or lightheadedness, stop what you’re doing immediately and find a cool place to rest and drink some water.

What should you do if you experience symptoms of dehydration?

If you start to notice any of the signs or symptoms associated with dehydration, such as dizziness, fatigue, dry mouth, or a rapid heart rate, it’s important to take action right away. First and foremost, find a cool place to rest and begin drinking water immediately. The amount of water you need will depend on your size, weight, and activity level, but it’s recommended to drink at least one liter of water per hour if you’re severely dehydrated. You should also consider taking electrolyte supplements or a sports drink that contains electrolytes like sodium, potassium, and magnesium to help replace the minerals lost in sweat.

It is important to seek medical attention if your symptoms don’t improve with rest and hydration, or if you experience any of the more serious symptoms like confusion, difficulty breathing, an abnormally fast heart rate, or seizures. These could be signs that you are suffering from a more severe case of dehydration and need urgent medical treatment.


In conclusion, dehydration is a serious health risk, especially in hot environments and during times of strenuous physical activity. It’s important to be aware of the signs and symptoms associated with dehydration and to take action right away if you start to feel any of them. Prevention is key so make sure you are getting enough water throughout the day and avoiding sugary drinks, and take electrolyte supplements before and after exercise. Finally, don’t hesitate to see a doctor if your symptoms don’t improve with hydration or rest. Being aware of the risks associated with dehydration is essential to staying safe.

Health Fitness Art is a company that believes in the importance of preventive care. We have experienced staff who provide our members with the best possible advice. We provide valuable information on how to improve your lifestyle and achieve better overall health. Our mission is to make our community healthier.

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