7 Signs of Dehydration While Running: Symptoms & How to Stay Hydrated

1. Dry Mouth

One of the first signs of dehydration is dry mouth. I have felt this extreme dry mouth feeling when I have run fiercely hot marathons and become dehydrated due to excessive water loss. The effects at this point of dehydration can often be coupled with a lingering headache and persistent thirst. This is a very uncomfortable feeling that indicates your body is struggling to produce adequate saliva. Avoid these effects of dehydration and drink some water or electrolyte-rich coconut water before your next run, and keep an eye out for sluggish muscle recovery later in the day.

2. Muscle Fatigue

You get to the point in your run where you feel like you cannot run another step. Did you drink enough water today? In order for your cells to function, transport nutrients, and flush out metabolic waste, you need water. Feed your cells the water they require and avoid this fatigue by drinking 10-12 glasses of water a day. When running while dehydrated, your muscles work significantly harder to sustain normal output, which can quickly trigger sudden dizziness or early exhaustion.

3. Decrease in Urination

If you are rarely getting up to go to the bathroom, you can be mildly dehydrated. If you are unable to urinate at all, you may be severely dehydrated. If your urine is darker in color or strong smelling, you could be severely dehydrated, which can cause permanent kidney damage. Make sure to look at the color of your urine when you have a decreased output of urine. Drink water with every meal and in between to avoid these effects of dehydration and dangerous dehydration symptoms running causes.

Monitoring your fluid output is one of the simplest ways to stay ahead of fluid loss:

4. Poor Concentration or Altered Mental Status

If you start to feel poor concentration or confusion, you could have extreme dehydration that is making you feel this way. Disorientation during a run is a serious red flag—seek medical care immediately. To avoid this, make sure to drink water along with coconut water or another electrolyte fluid to maintain potassium and sodium balance. Consulting clinical guidance on hydration can help you establish a proper daily hydration plan.

Understanding how fluid loss impacts your athletic capabilities helps you spot early warning signs:

5. Dizziness

Often your blood pressure drops largely due to dehydration, which can cause dizziness and lightheadedness while running. This can be coupled with a shaky, unstable feeling on your feet. Avoid this blood pressure surge and drink some water, would you? Maintaining adequate fluid intake prevents sudden drops in plasma volume and helps protect against severe muscle fatigue.

6. Rapid Heart Rate

A rapid heart rate is a sign of severe dehydration. Your heart rate increases in order to stabilize blood pressure as your blood pressure will drop from fluid loss. Water is urgent and you may want to seek medical attention if your heart rate remains elevated out of proportion to your pace. To avoid this cardiovascular strain, drink water throughout the day rather than chugging water right before stepping out the door.

7. Longer Recovery

Did you know that after you are dehydrated, your body will feel this during and after the workout? The next day it will take longer for your muscles to recover from training stress. You may even experience some uncomfortable muscle cramping and lingering stiffness. To avoid these unwanted effects of dehydration after running, remember H20 is the way to go!

Better your athletic performance and have the energy to push through your runs by staying fully hydrated. And a bonus is you will have more energy throughout the day if you maintain healthy hydration levels. Drink up please! What is your drink of choice while you run? Do you make sure to stay hydrated through all your runs?