Losing consciousness by heat syncope

Last Updated on February 2, 2023 by Dr. Saqib Mueed

Heat syncope is the medical term of losing consciousness due to temperature rise. Heat syncope is also known as the illness of heat. The simple indications of heat syncope are collapsing with or without psychological misperception. Heat syncope is triggered by exterior vessel enlargement resulting in reduced blood flow to the brain and dryness.

 Heat syncope occurs when our body tries to cool itself from overheating. Inadequate supply of fluids to the brain leads to dehydration. It also occurs due to if someone standing for long periods without movement or muscular activity or lying position in the heat. Heat syncope leads to excess dripping. [1]Heat Syncope | Korey Stringer Institute (uconn.edu)

Heat syncope explained by Deanna

He says;

       “Heat syncope is just a word for passing out”

  • Your vessels widen
  • Your blood pressure will be lower
  • You may feel giddy
  • You faint

Causes of Heat syncope

Heat syncope happens in a heartfelt environment when blood pressure is dropped as the body stretches (widens) arterioles (small body vessels) in the skin to emit heat. This illness arises within five days of heat accommodation before the blood volume inflates.

The common cause of syncope is vasovagal syncope. This is known as cardio-neurogenic syncope.  This is triggered through quick drib in blood force which reasons a drop in the plasma stream. [2]Heat Syncope – an overview | ScienceDirect Topics

Pathophysiological basis

  • The regular disaster of brainy perfusion through a decrease in analytical oxygen unavailability.
  • Brainy perfusion or oxygenation amended for 8 to 10s:
  • Paleness or sweltering
  • The exertion of the period is transitory generally less than 10s


The symptoms of heat syncope are related to others’ faintness but some major symptoms of heat syncope are given below. 

  • Anxiety 
  • Biliousness 
  • Brief loss of mindfulness
  • Dry lips
  • Extra dripping 
  • Feebleness 
  • Giddiness 
  • Headache 
  • Increase pulse rate 
  • Light, unruffled and moist skin
  • Queasiness 
  • Stumpy blood pressure [3]Heat Stress Related Illness | NIOSH | CDC

Medical treatment     

    Hands with heat syncope should:

  • Sit or snooze in a cool apartment when they begin to feel signs
  • Slowly drink water pure juice or a sports liquid refreshment.
  • Pursue instant medical attention for continual events of collapsing or if the individual experiences chest pain, annexation, or misperception.
  • Transfer the individual in a cooler under the trees zone


The procedure that is used for the handling of heat syncope is similar to other sorts of pass out. If the heat syncope is not preserved at a suitable stage than it primes to heatstroke. A specific who stimulated by heat syncope will be improved in 10 to 15 mint through the least precaution. To extravagance the specific who are stimulated by heat syncope resulting phase that is used to indulgence with the heat syncope:

  • First of all passage the being to unflappable place to diminish body fever.
  • If the indications of heat syncope are existent in the individuals.
  • Enquire the individuals to sit down 
  • Elevated his leg up.
  • If the signs of heat syncope have seemed in the specific preserve the ice in his arms and among the legs to diminish the infection. Water enclosing salt and other brands of cold drinks are assumed to the being.
  • The affected being must take whole rest to protect from heat syncope quite it principals to warmth blow.

Prevention of Heat syncope

Heat syncope is a condition that arises due to overheating. In heat syncope the result in an inadequate supply of blood to the brain because the blood is pool toward the feet. It causes sweating. One can prevent heat syncope by adopting the following step.

  • Avoided working on a hot day
  • If a person feel a symptoms of heat syncope soon he moves to a cool or shady place.
  • In hot weather condition to avoid alcohol because it also leads to dehydration that is a worsen symptoms.
  • Use plenty amount of water
  • Avoiding alcohol and avoiding exposure to the warm environment
  • Attire such type of dress that blocks sun rays.
  • Steady exercise during a cooler period of the day [4]Heat stroke (biomedcentral.com)

Reviewed by:
Dr. Shafaat Yar Khan  (Ph.D.) 
Medical University of Vienna, Austria 
Present: University of Sargodha, Pakistan

Our reviewers’ details, Click Here

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