Woman Drinking Water

Can Dehydration Cause Nausea? How to Beat It with Proper Hydration

Dehydration is a pervasive health issue that can manifest in numerous ways, one of which is nausea. This unsettling sensation is often a sign that your body is crying out for help, signaling a deficiency of crucial fluids. But how exactly does dehydration trigger nausea? And what steps can you take to counteract this discomfort with appropriate hydration strategies?

This article will delve into the links between dehydration and nausea, highlighting the importance of maintaining optimal fluid balance for overall health and well-being. It will explore the science behind dehydration-induced nausea, provide clear indicators to look out for, and suggest practical, proven ways to keep dehydration at bay with proper hydration techniques. So whether you’re a health enthusiast, a fitness fanatic, or someone simply seeking to understand more about the body’s intricate workings, this article is for you.

What is Dehydration?

Dehydration, fundamentally, is a state where your body doesn’t have the amount of fluids necessary to carry out its normal functions efficiently. It’s a deficit in the overall fluid balance due to the body losing more water than it’s taking in.

Water plays a vital role in many bodily processes — from regulating body temperature and flushing out toxins to aiding digestion and lubricating joints. The body’s composition is largely water, constituting about 60% of an adult’s body weight. Every cell, tissue, and organ needs water to work correctly. Therefore, maintaining an appropriate water balance is critical for our bodies to function effectively. When this balance is disrupted, it leads to a state of dehydration.

Dehydration also occurs when we don’t replenish the fluids we lose through various processes, such as sweating, breathing, and urinating. It can happen due to intense physical activity, being in a hot or humid environment, or not drinking enough water regularly. Left untreated, dehydration can lead to severe complications and potentially become life-threatening.

Signs and Symptoms of Dehydration

There can be many telltale signs of dehydration, ranging from mild to severe. Depending on the severity, these symptoms can affect different body parts and manifest in varying degrees. The following are some general signs to watch out for:


Thirst is one of the earliest and most obvious signs of dehydration. Our brain sends signals that we need water when it detects a decrease in our body’s water levels. However, it’s important to note that thirst isn’t a foolproof indicator of hydration needs. Often, when you feel thirsty, you may already be mildly dehydrated.

Dry Mouth and Swollen Tongue

A dry mouth and swollen tongue can be a clear sign of dehydration. Saliva production decreases when the body is dehydrated, leading to a dry mouth. On the other hand, a swollen tongue can occur due to the body’s struggle to produce enough fluids.

Fatigue and Lightheadedness

Dehydration can also lead to feelings of fatigue, weakness, and lightheadedness. This is because when our body’s fluid levels are low, it puts extra strain on our heart to maintain blood pressure and circulate oxygen and nutrients, leaving us tired or dizzy.

Dark Urine

The color of your urine can be a good indicator of your hydration levels. If you’re adequately hydrated, your urine should be a light yellow color. Dark yellow or amber-colored urine can be a sign that your body is getting rid of wastes with less water, indicating dehydration.

Dry Skin and Poor Skin Elasticity

Dehydration can lead to dry, flaky skin and poor skin elasticity. Water is crucial for maintaining skin moisture and delivering essential nutrients to the skin cells. When you’re dehydrated, the skin may take longer to return to its normal state after being pinched, known as ‘skin turgor.’

Infrequent Urination

If you’re not urinating as often as usual, it may be a sign that your body is trying to retain fluid due to dehydration. In severe cases, dehydration can even lead to a complete lack of urination.

Rapid Heartbeat and Breathing

When dehydrated, our blood volume drops, causing the heart to work harder to pump blood. This can lead to rapid heartbeat and breathing as your body compensates for the lack of fluids.

In severe cases, symptoms may escalate to confusion, irritability, sunken eyes, fainting, and, in extreme cases, unconsciousness or delirium. If any severe symptoms are observed, immediate medical attention is required.

What Causes Dehydration?

As mentioned earlier, dehydration can occur in various scenarios. Many factors can contribute to fluid loss in the body, including:

Excessive Sweating

Sweating is the body’s natural mechanism for maintaining temperature. During strenuous physical activity or in hot weather, your body loses fluids through sweat. If these fluids are not replenished in time, it can lead to dehydration. Hence, athletes or people who work outdoors are at a higher risk of dehydration.

Inadequate Water Intake

Not drinking enough water regularly is one of the simplest yet most common causes of dehydration. This could be due to a lack of access to clean water, being too busy, or simply forgetting to drink water. Regardless, inadequate water intake can disrupt the body’s fluid balance and lead to dehydration.

Diarrhea and Vomiting

Diarrhea and vomiting can cause a significant loss of water and electrolytes in a short time, leading to severe dehydration. This is especially true in the case of illnesses such as food poisoning, stomach flu, and other digestive disorders where diarrhea and vomiting are common symptoms.


When you have a fever, your body loses fluids through sweat as it tries to cool down, contributing to dehydration. The higher the fever, the more at risk you are. If the fever is accompanied by vomiting or diarrhea, the risk of dehydration is even greater.

Increased Urination

Certain medical conditions like uncontrolled diabetes or specific medications like diuretics can cause frequent urination, leading to significant fluid loss and, eventually, dehydration. If you notice a sudden increase in your urge to urinate, it’s crucial to increase your fluid intake and seek medical advice if the condition persists.

Burns or Skin Infections

Skin burns or infections can lead to fluid loss as the body increases fluid circulation to the affected areas. This fluid loss can be significant in severe burns and infections, leading to dehydration.

Alcohol Consumption

Alcohol is a diuretic, which means it makes you pee more and lose fluids. Consuming alcohol, especially in large amounts, can quickly lead to dehydration. It’s always a good idea to alternate alcoholic drinks with water to prevent dehydration.

Can Dehydration Cause Nausea?

Yes, dehydration can indeed lead to feelings of nausea. When your body is dehydrated, it can disrupt various bodily functions, including digestion, which, in turn, can cause nausea. Here’s how this happens in more detail:

The body’s cells require a precise balance of water and electrolytes to function optimally. This balance is disrupted when dehydration occurs, leading to improper cell function. One of the areas where this imbalance is felt most acutely is in the stomach and intestines. The digestive process relies on certain levels of acidity and alkalinity, which can be thrown off by dehydration. This imbalance can slow the emptying of the stomach, resulting in a feeling of nausea.

Additionally, dehydration can lead to a decreased blood volume, which means the heart has to work harder to deliver blood to your organs, including your digestive tract. This reduced blood flow to the digestive tract can slow down the digestive process and lead to feelings of nausea.

Furthermore, the brain also communicates with the gut during dehydration. When the body is dehydrated, the brain triggers the feeling of thirst. However, if the dehydration is severe or prolonged, the brain may also cause feelings of nausea as a warning signal to prompt an individual to address the lack of fluid intake.

Lastly, when dehydration is caused by heat or during strenuous exercise, the body may prioritize cooling down and sending blood to the skin and muscles instead of the gut, slowing digestion and causing feelings of nausea.

In summary, while nausea can be a symptom of many conditions if it’s accompanied by signs of dehydration, there’s a strong chance that lack of proper hydration is the cause. Therefore, paying attention to your body’s hydration needs is crucial to prevent not just nausea but a host of other potential health problems.

How to Rehydrate When Nauseous

Rehydration when nauseous can be a delicate process. It’s crucial to proceed gently to avoid exacerbating the feeling of nausea. Below are some steps to guide you through the process:

  1. Sip small amounts: Start by taking small sips of water or a rehydration drink every few minutes. Taking in too much fluid at once can upset your stomach and worsen feelings of nausea.
  2. Use oral rehydration solutions: Oral rehydration solutions (ORS) such as Pedialyte, Gatorade, or similar sports or pediatric drinks are designed to replace the salts and sugars your body loses during dehydration. They can be a more effective way to rehydrate than water alone.
  3. Try ice chips or popsicles: If you’re finding it hard to keep liquids down, sucking on ice chips or popsicles made from a rehydration drink can be a more palatable way to reintroduce fluids.
  4. Avoid caffeine and alcohol: Both of these substances have diuretic effects, meaning they can cause your body to lose more water and worsen dehydration.
  5. Eat water-rich fruits: Once you can eat, water-rich fruits like watermelon or grapes can help boost your hydration.
  6. Rest: Rest is an important part of rehydration, as it allows your body to focus its energy on rebalancing your fluids.

Rehydrating when you’re nauseous is important because your body needs proper fluids. Fluids carry nutrients to your cells, flush bacteria from your bladder, and prevent constipation. Dehydration can lead to impaired physical performance, reduced cognitive function, kidney problems, and, in severe cases, heat injury. Therefore, even when you’re feeling nauseous, striving for rehydration is essential.

How to Prevent Dehydration

Preventing dehydration is crucial for maintaining good health and optimizing physical and cognitive performance. Here are some strategies to ensure you stay adequately hydrated:

Regular Fluid Intake

Drinking enough fluids regularly, especially water, is the most straightforward way to prevent dehydration. The recommended daily water intake varies depending on age, sex, weight, and physical activity level. Still, a general guideline is to aim for 8-10 glasses of water per day.

Hydrate Before, During, and After Exercise

If you’re engaged in physical activity, especially high-intensity workouts or endurance sports, ensure you’re well-hydrated before starting, drink fluids regularly during the activity, and rehydrate post-workout. This replenishes the water and electrolytes lost through sweat.

Consume Fluid-Rich Foods

Besides drinking fluids, consuming foods high in water content also contributes to your hydration level. Fruits and vegetables like watermelon, cucumbers, oranges, and strawberries are excellent sources of hydration.

Use Rehydration Solutions if Needed

Consider using oral rehydration solutions in situations of significant fluid loss due to sweating, diarrhea, or vomiting. These drinks contain water and salts in specific proportions to replenish both water and electrolytes lost from the body.

Be Aware of the Climate

Weather conditions affect your hydration needs. In hot or humid weather, your body loses more water through sweat and needs extra hydration. In contrast, during cold weather, the body’s thirst response diminishes, even though your hydration needs remain. So, it’s essential to consciously hydrate regardless of feeling thirsty.

Limit Alcohol and Caffeine

Both alcohol and caffeine have diuretic effects, causing more frequent urination, speeding up fluid loss, and potentially leading to dehydration. If you do consume these beverages, balance it out with an equivalent amount of water.

Monitor Hydration Levels

Pay attention to signs of dehydration in your body, like the color of your urine, which should ideally be light yellow. If it’s dark, it may be a sign that you need to increase your fluid intake.

Consult Healthcare Professionals

If you have any health conditions or take medications that might affect your body’s water levels, consult with healthcare professionals to understand your specific hydration needs.

In summary, maintaining hydration is not about chugging large amounts of water at once but consistently providing your body with small amounts of fluids throughout the day. Remember, every individual’s hydration needs are unique, and it’s essential to tailor your hydration strategy to your specific needs, lifestyle, and health condition.


Staying hydrated is crucial for maintaining good health and preventing dehydration. While mild cases of dehydration can be remedied by drinking fluids, severe cases may require medical attention. By understanding the signs and causes of dehydration, you can take appropriate measures to maintain optimal hydration levels and prevent related symptoms like nausea.

Remember, prevention is always better than cure, so stay aware of your body’s hydration needs and strive to meet them. Your body will thank you for it! So, keep sipping on that water or rehydration drink throughout the day, and stay hydrated.


How do you know if you have nausea from dehydration?

Nausea can be a symptom of many conditions, but if it’s accompanied by signs of dehydration such as dry mouth, dark urine, and dizziness, there’s a strong chance that lack of proper hydration is the cause.

How do you get rid of nausea from dehydration?

Rehydrating with small sips of water or rehydration drinks, avoiding caffeine and alcohol, consuming water-rich fruits, and rest can help alleviate nausea caused by dehydration. It’s best to proceed gently to avoid exacerbating the feeling of nausea.

How can I rehydrate fast?

The fastest way is by consuming oral rehydration solutions designed to replace water and electrolytes lost during dehydration. Rest, avoiding diuretic substances like alcohol and caffeine, and slowly sipping on fluids throughout the day can also help.

Does drinking water cure nausea?

For some people, drinking water may alleviate nausea caused by dehydration. But if the nausea is due to other reasons, simply drinking water may not be enough. It’s essential to identify and address the underlying cause of nausea for effective treatment.

Share this post:
Scroll to Top