Dizzy? Heatstroke or Heart Stress? Learn More

Heat Stroke or Cardiovascular Stress? Understanding Heat-Related Dizziness 

On a typical summer afternoon — hot, humid, and draining — you might be out running errands, working under the sun, or engaging in a strenuous workout. Suddenly, you may experience dizziness, a rapid heartbeat, or even nausea. The initial assumption could be dehydration, but there might be other factors to consider. 

While dehydration often causes lightheadedness during heat exposure, it's not always the complete explanation. Sometimes, dizziness can indicate more serious issues related to the heart and circulatory system. 

What Happens in the Body During Extreme Heat? 

In hot temperatures, the body works hard to regulate its core temperature. Blood vessels near the skin dilate to release heat, and sweating increases to cool the body down. These processes are essential but also strain the cardiovascular system. 

Here's how: 

• Blood pressure drops as blood vessels expand. 
• Fluid loss from sweating reduces blood volume. 
• The heart pumps faster to compensate for both changes. 

For many individuals, this extra workload is manageable. However, for those with underlying health conditions, the added stress can reveal problems like heart disease, arrhythmias, or chronic low blood pressure. 

Recognizing the Signs: Is It Just Heat Exhaustion or Something More? 

Empower yourself by understanding your body's signals. Here are some symptoms to look for: 

Common Symptoms of Heat-Induced Dizziness: 

• Dizziness or lightheadedness, especially when standing up 
• Fatigue or weakness 
• Increased heart rate (tachycardia) 
• Nausea or headache 
• Pale, clammy skin 
• Shortness of breath 

Key Difference: 

Understanding this key difference can enlighten you and potentially save a life: heat exhaustion is a common issue during hot weather, but it's crucial to recognise when it might be a sign of cardiovascular stress or early signs of heart trouble. 

Who's Most at Risk? 

Certain groups are more susceptible to cardiovascular strain during heat exposure due to physiological or lifestyle factors. 

1. Outdoor Workers (e.g., farmers, construction workers, delivery staff) 

• Exposed to direct sunlight and physical demands 
• Limited access to shade or hydration breaks 
• Increased risk of dehydration, heat exhaustion, and sudden cardiac events 

2. Gym-Goers and Athletes Training in Hot Conditions 

• Engaging in intense workouts in hot environments 
• Underestimating fluid loss 
• Prone to electrolyte imbalance and elevated heart rates 

3. Fasting Individuals (e.g., during Ramadan or intermittent fasting) 

• Reduced fluid intake during daylight hours 
• Lower energy levels and a potential drop in blood sugar 
• There is a higher chance of low blood pressure and fainting spells 

4. Middle-Aged and Older Adults 

• Declining heart function and circulation 
• Likely pre-existing conditions such as hypertension, diabetes, or obesity 
• May take medications affecting blood pressure or fluid balance 

Tailored Advice for High-Risk Groups: 

• Outdoor workers should take regular breaks in shaded areas and wear cooling gear. 
• Gym-goers should monitor their heart rate and adjust intensity during heat waves. 
• Fasting individuals should hydrate well before sunrise and have breakfast immediately if they feel unwell. 
• Older adults must avoid midday heat exposure and check their blood pressure regularly. 

Practical Steps to Prevent Heat-Induced Cardiovascular Stress 

Preventing heat-related issues involves more than just staying hydrated. 

Stay Hydrated, Not Just with Water 

• Drink fluids throughout the day, not just when thirsty 
• Include electrolyte-rich drinks during heavy sweating 
• Avoid alcohol and caffeine, which can worsen dehydration 

Acclimatize Gradually 

Ease into activity over 7–10 days if unused to hot weather 

Start with shorter durations and lighter intensity, then gradually increase 

Dress Smartly 

• Wear light-coloured, loose-fitting clothing 
• Use wide-brimmed hats and sunglasses outdoors 
• Apply cooling towels or mist sprays during prolonged heat exposure 
• Time Activities Wisely 
• Avoid peak heat hours (11 AM – 4 PM) 
• Plan a heavy activity for early morning or late evening 
• Take frequent breaks and stay in air-conditioned spaces when possible 

Monitor Your Health 

• Use a fitness tracker to monitor heart rate 
• Regularly check blood pressure and pulse 
• Keep a symptom diary — note when dizziness occurs and activities involved 

Seek medical attention if experiencing: 

• Recurrent dizziness after proper rest and hydration 
• Chest pain or tightness 
• Persistent rapid or irregular heartbeat 
• Shortness of breath without exertion 
• Episodes of fainting 
• Doctors may recommend blood pressure monitoring, electrocardiograms (ECGs), echocardiograms, stress tests, or cardiologist referrals. 

Observe Body Signals 

Lightheadedness in the context of heat exposure can be a critical early warning sign. Pay attention to these symptoms and consult a doctor if they persist. 

Take a Step towards promoting safety during hot months by sharing this article with individuals who spend time outdoors or have pre-existing health conditions. Your act of sharing can save lives. 

Engage With Us! 

Share this BLOG with friends and family. 

Leave a comment: Do you have a question or experience to share? Email drasiya@primehealth.ae or myprime@primehealth.ae to start a conversation. 
 

Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice.