How Long Does Heat Exhaustion Last?

Heat exhaustion

Want to know how long does heat exhaustion last? Well, you have landed on the right article.

Heat exhaustion arises when the body becomes dehydrated and loses its ability to regulate internal temperature. While not typically life-threatening, it can be treated with rest and fluid intake. This article explores symptoms, treatment, and prevention of heat exhaustion.

What is Heat Exhaustion?

The body typically regulates internal heat by increasing blood flow to the skin’s surface and releasing sweat. However, in warm, humid conditions, sweat evaporation is hindered, compromising the body’s cooling mechanism.

Dehydration leads to a deficiency of water and electrolytes, impairing sweating ability.

Heat exhaustion occurs when the body’s cooling through sweat is inadequate.

While heat exhaustion often results in elevated body temperature, it can paradoxically make a person feel cool.

Symptoms of Heat Exhaustion?

Symptoms of heat exhaustion, which can resemble those of various medical conditions, should not be overlooked.

Typical signs include:

  • Weak and fast pulse
  • Excessive sweating
  • Elevated internal body temperature
  • Muscle weakness or cramps
  • Nausea
  • Headache
  • Dizziness
  • Cold, pale, moist skin, occasionally with goosebumps
  • Low blood pressure or dizziness upon standing or bending over
  • Vomiting
  • Irritability or aggressive behaviour
  • Flushed, red face
  • Rapid and shallow breathing

How long does heat exhaustion last?

 Heat exhaustion’s duration varies but generally lasts from a few hours to up to a couple of days. The timeframe hinges on factors such as the severity of the individual case and the immediacy of treatment. Swift intervention significantly influences recovery speed. Taking immediate steps like relocating to a cooler area, rehydrating adequately, and resting can hasten recuperation. However, it’s crucial to address heat exhaustion promptly, as unchecked symptoms can escalate to more critical conditions such as heatstroke. While most cases resolve with proper care, persistent or worsening symptoms require medical attention. Heat exhaustion serves as a warning sign, emphasizing the importance of heat safety and prevention measures. Overall, recognizing symptoms and responding promptly ensures a quicker return to well-being and helps mitigate the risk of heat-related complications.

What Causes Heat exhaustion?

Heat exhaustion commonly occurs due to a combination of physical exertion and warm weather.

Factors that contribute to an increased risk of heat exhaustion include:

  • High humidity, typically exceeding 60 percent.
  • Liver or kidney conditions.
  • Intense and strenuous physical labour.
  • Underlying health conditions that heighten dehydration risk, such as diabetes or hyperglycemia.
  • Crush injuries, where a body part is compressed or pinned by a heavy object.
  • Substance abuse involving drugs.
  • Heavy or prolonged alcohol consumption.
  • Smoking or tobacco use.
  • Being overweight.
  • Certain medications, particularly those that increase dehydration risk, such as medications for depression, insomnia, allergies, and poor circulation.
  • High blood pressure.
  • Heart disease.
  • Being under 4 or over 65 years old.


If heat exhaustion is suspected, it is crucial to immediately cease exercise or physical activity. It is also important for the person to hydrate themselves promptly.

Additional recommendations for treating heat exhaustion include:

  • Finding a cool and shaded area or moving indoors.
  • Loosening clothing.
  • Lying down flat on the back.
  • Taking a lukewarm or cool shower.
  • Applying a cool and wet cloth to the face and chest.
  • In severe cases, placing ice packs under each armpit and behind the neck.
  • Consuming electrolyte-containing drinks, like Gatorade or Gastrolyte, at a rate of 1 liter per hour.


To rehydrate effectively, you can create a homemade oral rehydration solution using these steps:

  1. Boil 5 cups (1 litre) of water.
  2. Remove from heat and add 6 teaspoons (tsp) of sugar and ½ tsp of table salt, stirring until dissolved.
  3. Allow the solution to cool before consuming.
  4. Enhance the taste by adding natural flavourings like fruit juices, honey, or maple syrup.

Alternatively, certain drinks and foods can act as oral rehydration options, including:

  • Gruel (cooked cereal and water)
  • Rice water or congee
  • Green coconut water
  • Fresh fruit juices, such as orange, pear, or peach
  • Weak, non-caffeinated tea
  • Carrot soup
  • Banana puree mixed with water

In most cases, symptoms of heat exhaustion will begin to improve within 30 minutes. However, if symptoms persist after 30-60 minutes, it is important to seek medical attention.

Medical treatment for heat exhaustion typically involves intravenous (IV) fluids and electrolytes, administered in one or two litres.

If symptoms do not resolve with fluids and rest, further medical evaluation, including blood work-up and clinical tests, may be conducted to rule out other potential causes.

With prompt treatment, individuals usually experience full recovery from heat exhaustion within 24-48 hours.


To summarise, the duration how long does heat exhaustion last can vary based on several factors, including the severity of the condition, the individual’s overall health, and the promptness of treatment. In most cases, with proper and timely intervention, individuals experiencing heat exhaustion can recover within a few hours to a couple of days. However, it’s essential to recognize that heat exhaustion serves as a warning sign of potential heat-related illnesses, and its prompt and appropriate management is crucial to prevent it from progressing into a more severe condition like heatstroke. If symptoms of heat exhaustion are observed, it’s recommended to move to a cooler environment, rehydrate, and rest. Seeking medical attention if symptoms persist or worsen is vital to ensure a safe and complete recovery.


Q1: How long does it take to recover from heat exhaustion?

Ans: Usually within 24-48 hours with proper treatment.

Q2: When should I seek medical attention for heat exhaustion?

Ans: If symptoms persist after 30-60 minutes or worsen.

Q3: What are some oral rehydration options for heat exhaustion?

Ans: Homemade solutions, fruit juices, rice water, coconut water.

Q4: What are common symptoms of heat exhaustion?

Ans: Weak pulse, excessive sweating, dizziness, nausea, headache.

Q5: What are some cooling measures for heat exhaustion?

Ans: Use cool clothes, take a cool shower, apply ice packs under your armpits and neck.



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