Can Dehydration Damage Your Kidneys?

Introduction

The kidneys are located on either side of the spine in the upper part of the back, just below the rib cage. They are responsible for filtering out toxins and harmful substances from the body. This helps balance electrolytes and remove excess water as urine, which helps maintain normal blood pressure.

If there’s a lack of fluid in the body, it can impact kidney health, causing an imbalance in the body's internal systems. Hence, it is important to understand dehydration and kidney damage and their long-term effects.

What are the Common Signs of Dehydration?

Dehydration does not occur suddenly and often goes unnoticed until the symptoms worsen. Here are some dehydration symptoms you need to look out for - 

Early Signs

• Dark Yellow Urine: It indicates concentrated urine due to limited water intake and insufficient fluid filtration. 

• Reduced Urine Volume: Due to low water intake, urine volume decreases as kidney filtration slows. 

• Dry Mouth and Lips: The low water intake causes the body to produce less saliva. This leads to overall fluid depletion in the body. 

• Tiredness: A person may feel more tired due to reduced blood volume and decreased oxygen delivery to tissues. 

Advanced Signs

• Confusion or Dizziness: Reduced blood flow to the brain can lead to an electrolyte imbalance. This leads to confusion and dizziness. 

• Reduced Urination: It is a severe sign of kidney damage, which occurs when the kidneys retain water to support vital body functions. 

• Strong-Smelling Urine: It indicates that waste products are more concentrated because the body lacks sufficient water to dilute them. 

• Muscle Cramps: These usually occur due to electrolyte imbalances and reduced fluid availability in muscles. 

Note: Water loss is one of the most common causes of kidney damage. Hence, to ensure they are functioning properly, drink plenty of water. 

What are the Causes of Dehydration?

Dehydration can place stress on the kidneys and lead to damage. However, dehydration occurs when the body loses excess water due to potential reasons, such as - 

• Sweating: This usually occurs due to excessive exercise, burns, or skin diseases. 

• Water Loss from Kidneys: This occurs when a person has hyperglycemia, acute or chronic kidney disease, or uses diuretics. 

• Water Loss from the GI Tract: This results from vomiting, diarrhoea, or laxative use. 

• Water Loss Through Abdomen: This happens due to pancreatitis, ascites, or peritonitis. 

Other reasons may include sepsis, side effects of certain medications, chronic obstructive pulmonary disease, and hyperthyroidism. Adults are most likely to experience dehydration due to certain underlying health conditions, such as kidney disease, diabetes, and immobility. 

What are the Immediate Effects on the kidneys?

Approximately 60-70% of the body's weight is water, and all organs require it to function efficiently. 

When body fluid decreases, it directly affects kidney function. This reduces blood flow to the kidneys, impairing their ability to filter efficiently due to decreased oxygen supply. So, when there is a fluid deficiency in the body, the kidneys conserve water. This causes the urine to be more concentrated. 

This increases kidney stress, as they have to work harder to maintain fluid balance. When the body becomes severely dehydrated, the strain on the kidneys increases significantly. This causes acute kidney injury (AKI), a sudden decline in kidney function. 

How to Maintain Kidney Health?

There are several ways to maintain kidney health - 

• Quit smoking and limit/avoid alcohol

• Maintain healthy blood pressure and blood sugar levels

• Take any medication only under a professional’s advice

• Workout efficiently and aim to achieve a moderate weight

• Eat a kidney-friendly diet, such as eating more fruits and vegetables, and take less salt

Hydration Importance for Kidney Health

Here’s why it is important to stay hydrated for optimal kidney health - 

• It helps the kidneys filter out waste from the blood more efficiently

• Reduces the risk of highly concentrated urine, which can strain the kidneys

• Lowers the chances of kidney stone formation by keeping the urine diluted

• Maintain fluid balance to ensure the kidneys function efficiently. 

Note: It is advised to see a doctor to understand how much water a person needs. The doctor may help with water intake guidelines customised to their condition, body needs, and kidney function. 

Hydration Tips for Healthy Kidneys

Here are some tips to help maintain healthy kidneys - 

Drink Enough Water Consistently

It is advised to drink at least 6-8 glasses of water daily (baseline). However, depending on body size and weight, exercise intensity, sweating, and other factors, water intake may vary. 

Adjust Water Intake Based on Routine

The hydration requirement is not the same every day. Weight, activity level, hot weather, fever, vomiting, etc., can all increase fluid needs. 

Do Not Wait to Get Thirsty

Thirst can be one of the last symptoms of dehydration. So, it is advised to sip water regularly throughout the day. 

Watch the Color of the Urine

If the urine is darker in colour, it is more concentrated and may indicate that a person needs to drink more water. According to the urine colour chart, a pale yellow colour indicates sufficient hydration. 

Hydration vs Kidney Health Comparison

 

Kidney Treatment at NU Hospitals

Kidney problems can affect blood pressure, fluid balance, energy levels, and overall health. At NU Hospitals, kidney specialists approach the situation with close clinical attention, advanced diagnostic methods, and care plans tailored to the patient's condition, based on the urine colour chart and other factors. 

The care team focuses on identifying the root cause of symptoms and guiding patients towards the most suitable treatment path. This may include laboratory testing, imaging, medication, lifestyle support, and specialist-led management for complex kidney conditions. 

It is important to take prompt action whenever a person experiences signs of dehydration and kidney damage. If left untreated, it can place additional stress on kidney function. 

Kidney Damage Warning Signs and Expert Care at NU Hospitals

Kidney damage may not be apparent at first, and it can develop without the person knowing. Hence, it is advised not to overlook even a minor symptom. Check for changes in urine pattern and colour, along with lower back discomfort, nausea, fatigue, and unexplained weakness throughout the body. If there is one or more symptoms, seek medical help immediately. Visit NU Hospitals for a thorough evaluation, during which the nephrologist assesses kidney function and identifies the cause of the damage. Our doctors are backed by an advanced medical facility equipped with cutting-edge technology and state-of-the-art infrastructure to deliver optimal outcomes.

Dehydration may seem like nothing, but it slowly damages the kidneys and their function. Hence, it is important to treat even minor dehydration or kidney damage before it becomes more serious.