Hypovolemia Vs Dehydration – TOP REVIEW

Hypovolemia and dehydration is the most common and worldwide problem. Let’s find the different. – Hypovolemia vs dehydration.


Dehydration is the loss of excess water and minerals from our body due to many reasons. A dehydrated person is water-deprived and thirsty in almost all cases.


Hypovolemia is less amount of water inside blood vessels, most probably due to dehydration or bleeding.

What is the difference between Dehydration and hypovolemia?

Dehydration is caused by less drinking of water or more wastage than consumed. In other words, when the output of water and minerals becomes more than the input and whole body deprived of water.

Most common cause of Dehydration is Diarrhea, especially in children and the most effective treatment is the replacement of water and minerals either by mouth (ORS) or Infusion (Ringer lactate). Vomiting and excessive sweating also cause Dehydration, but Diarrhea is still on the first spot.

Excessive urination in ‘Diabetic patient’ can also cause Dehydration, and that is why diabetic patients are told to drink plenty of water. Rarely, some genetic diseases also cause Dehydration due to excessive loss of water e.g., Cystic fibrosis.

On the other hand Hypovolemia is less volume of blood/water inside blood vessels. The most common reason is Dehydration, followed by Hemorrhage. A most common sign is low blood pressure and syncope.

Symptoms of dehydration

The Following are the earliest signs of dehydration.

Symptoms of Dehydration are almost the same as hypovolemia and might include hyperventilation or shortness of breath.

How to treat Dehydration?

Treatment of Dehydration depends upon the severity of Dehydration. There is 3 kind of dehydrations.

  1. Mild dehydration: When there is water loss without any obvious sign or symptom.
  2. Moderate dehydration: Water loss with signs of dehydration, mentioned above, but the patient is conscious.
  3. Severe dehydration: Water loss with signs and symptoms and loss of consciousness.

We prefer giving orally water and salt mixture called ‘Oral rehydrating solution’ or ‘ORS’ in Mild and Moderate Dehydration. The preferred criteria are offering an ORS solution after every Stool in Diarrhea.

If the patient does not recover, then we should go for an Intravenous infusion of ‘Ringer Lactate.’ For severe dehydration, always go for Intravenous Ringer lactate immediately as the patient can go into shock.

Hypovolemia can be treated with Intravenous infusions of different solutions, but we can go for blood transfusion for the immediate effect.

Prevalence of dehydration worldwide

Dehydration is a severe problem worldwide, especially in children. Dehydration due to diarrhea is the most common cause of death in infants. Keep drinking water regularly, especially in summers, to get rehydrated. – Hypovolemia vs dehydration.

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