Hypovolemia vs dehydration

Hypovolemia Vs Dehydration

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


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


Hypovolemia is less amount of water inside blood vessles most probably due to dehydration or hemorrhage.

What is the difference between Dehydration and hypovolemia? – Hypovolemia vs dehydration

Dehydration is caused by less drinking of water or more wastage than consumed. In other words when 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 replacement of water and minerals either by mouth (ORS) or Infusion (Ringer lactate). Vomiting and excessive sweating also causes Dehydration but Diarrhea is still on the first spot.

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

On the other hand Hypovolemia is less volume of blood/water inside blood vessles. The most common reason is dehydration followed by blood Hemmorhage. Most common sign is low blood pressure and syncope.

Symptoms of dehydration

Following are the earliest signs of dehydration.

  1. Weakness.
  2. Dizziness.
  3. Syncope.
  4. Low blood pressure.
  5. Thirst.
  6. Sweating.
  7. Urine retention.

Symptoms of dehydration are almost same to hypovoemia and might include hyperventilation or shortness of breath.

How to treat Dehydration?

Treatment of dehydration depends upon severity of dehydration. There are 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 which are mentioned above but patient is concious.
  3. Severe dehydration: Water loss with signs and symtoms and loss of consiousness.

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

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

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

Prevelance of dehydration worldwide?

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

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