Blood pressure during a Heat Wave. Do you know what to do?

Friends strolling down the sunlit street, embracing the heat of a summer day.

Heat waves can put serious stress on the body, especially on the cardiovascular system. High temperatures often cause blood pressure to fluctuate, sometimes dangerously. Knowing how to respond quickly with the right first aid can prevent complications and keep you or your loved ones safe during extreme heat.

How Heat Waves Affect Blood Pressure

When the temperature rises, your body works harder to cool down. Blood vessels near the skin widen to release heat, which can lower blood pressure. For some people, especially those with pre-existing hypertension or heart conditions, this can cause dizziness, fainting, or even shock. On the other hand, dehydration from sweating can thicken the blood, raising blood pressure and increasing the risk of heart attack or stroke.

People most at risk include older adults, those with chronic illnesses, and anyone taking medications that affect blood pressure. Recognizing symptoms early is key to preventing serious problems.

Signs That Blood Pressure Is Affected by Heat

Watch for these warning signs during a heat wave:

• Lightheadedness or dizziness

• Rapid heartbeat or palpitations

• Headache or confusion

• Excessive sweating or clammy skin

• Weakness or fatigue

• Nausea or vomiting

  
  

If someone shows these symptoms, it’s important to act quickly.

First Aid Steps to Take

Here’s what to do if you suspect heat is affecting blood pressure:

1. Move to a cooler place

   Get the person out of direct sunlight and into shade or an air-conditioned room.

   
   

2. Hydrate carefully

   Offer water or an electrolyte drink. Avoid caffeine or alcohol, which can worsen dehydration.

   
   

3. Rest and elevate legs

   Have the person lie down and raise their legs slightly to improve blood flow to the heart.

   
   

4. Loosen tight clothing

   This helps the body cool down more effectively.

   
   

5. Monitor symptoms

   Keep track of breathing, consciousness, and pulse. If symptoms worsen or do not improve within 15 minutes, seek medical help immediately.

   
   

6. Avoid sudden movements

   Standing up too quickly can cause fainting if blood pressure is low.

   
   

When to Call Emergency Services

Call for emergency help if the person:

• Loses consciousness

• Has chest pain or difficulty breathing

• Shows signs of heat stroke such as confusion, seizures, or very high body temperature

• Has a history of heart disease and symptoms worsen

  
  

Heat-related blood pressure issues can escalate quickly. Prompt medical attention saves lives.

Preventing Blood Pressure Problems in Heat Waves

Prevention is better than cure. Here are practical tips to protect yourself during hot weather:

• Stay indoors during peak heat hours (usually 11 a.m. to 4 p.m.)

• Drink plenty of fluids throughout the day

• Wear lightweight, loose-fitting clothing

• Use fans or air conditioning when possible

• Avoid strenuous activity during extreme heat

• Check on vulnerable family members or neighbors regularly

  
  

By taking these steps, you reduce the risk of heat-related blood pressure problems. Check out HST First Aid courses at https://www.hst.org.uk/courses