Heatwaves are often dismissed as mere discomfort, but a leading cardiologist warns that extreme temperatures can place serious strain on the heart and circulatory system—especially for those with pre-existing cardiovascular conditions. As much of the UK faces rising temperatures, experts emphasize that the heart must work much harder to cool the body, increasing health risks.
Dr Francesco Lo Monaco, founder of The National Heart Clinic, explains, “The heart typically pumps around five litres of blood per minute. In intense heat, this workload rises sharply as the body tries to maintain a safe temperature. Blood vessels dilate, heart rates increase, and more blood flows to the skin to dissipate heat. Meanwhile, sweating leads to fluid and electrolyte loss, challenging the body’s ability to sustain stable blood pressure and circulation.”
Studies link extreme heat with spikes in cardiovascular illnesses and fatalities, with vulnerable groups at heightened risk.
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Those most susceptible include individuals with coronary artery disease, heart failure, previous heart attacks or strokes, and high blood pressure. People with diabetes, kidney disease, obesity, and older adults—who often struggle to regulate temperature and hydration—also face increased danger. Dr Lo Monaco cautions, “Heat can trigger heart attacks, strokes, heart failure, atrial fibrillation, and serious arrhythmias, especially in those with existing heart problems.”
While feeling hot or tired during heat is common, certain symptoms should never be overlooked or attributed solely to the weather. Dr Lo Monaco advises, “Chest pain, severe shortness of breath, palpitations, confusion, and fainting are red flags that require immediate medical evaluation.”
Thankfully, many heat-related heart issues can be avoided through simple precautions: staying well hydrated, avoiding strenuous exercise during peak heat, seeking cool environments, wearing lightweight clothing, and limiting alcohol consumption all help reduce cardiovascular stress.
“Heatwaves increase cardiac demands, but simple preventive measures can markedly lower risks,” says Dr Lo Monaco. “Maintaining proper hydration, balanced activity, nutritious diet, and overall heart health is vital during hot spells. Prevention remains one of the most effective ways to protect your heart in the long term.”
Dr Lo Monaco elaborates on these vital practices in his book, Heart Saviour, where he provides guidance on lifestyle habits that support heart health—including hydration, nutrition, exercise, sleep quality, and stress management.