A cardiologist has urged people to look out for four telltale signs that your heart is “struggling” in the hot . With the UK experiencing high temperatures this week, including areas seeing over 29C, the expert implored people to seek help if they experience any of these symptoms.

Doctor Roy Jogiya, chief medical adviser at and consultant cardiologist at Kingston and St Thomas Hospital Foundation Trust, explained that our hearts have to work harder during hot weather. He said: “When exposed to extreme heat, the heart works harder to regulate body temperature.

“Widening of the blood vessels, known as vasodilation, and sweating occur to help cool the body down, but this increases the demand on the heart. The heart rate speeds up to pump blood through the wider blood vessels, which could potentially introduce strain to the cardiovascular system, especially in vulnerable individuals.”

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He warned: “Heatwaves have been linked to increased hospital admissions for heart attacks, particularly among the elderly and those with pre-existing heart conditions. There have been cases where extreme temperatures have triggered arrhythmias or even cardiac arrest, often in people who are already vulnerable.

Those most at risk include older adults and people with heart conditions, including high - something that around one in three UK adults are thought to have. Dr Jogiya said: “These groups may have poor heart and blood vessel function or be less able to adapt to heat stress, making them more likely to suffer from heat-related heart issues.”

Dr Jogiya listed some of the common warning signs that your heart may be struggling in hot weather. He said: “The key signs of heart strain in hot weather include breathlessness, dizzy spells, chest pain, and fatigue.

“While heat fatigue is common, heart-related symptoms tend to be more intense and persistent, often alongside discomfort or pressure in the chest.” The NHS warns that the following could be signs of a heart attack:

• Chest pain – a feeling of pressure, heaviness, tightness or squeezing across your chest
• Pain in other parts of the body – it can feel as if the pain is spreading from your chest to your arms (usually the left arm, but it can affect both arms), jaw, neck, back and tummy
• Feeling lightheaded or dizzy
• Sweating
• Shortness of breath
• Feeling sick (nausea) or being sick (vomiting)
• An overwhelming feeling of anxiety (similar to a panic attack)
• Coughing or wheezing.

If you think someone is experiencing a heart attack, you should call 999.

Dr Jogiya shared some tips for staying safe in the hot weather. He said: “To stay safe and hydrated, limit outdoor activity during peak heat, and rest in a cool environment. Wearing lightweight clothing and avoiding alcohol or caffeine, which can dehydrate, will also help. Cooling methods like fans or cool showers are important, especially for those at higher risk.”

“My key message is, stay aware of your heart health in extreme heat. Be proactive in managing hydration and rest. If you feel unwell, seek help immediately—early intervention can prevent serious complications.”

He added: “If you have concerns about heat-related health risks, especially regarding your heart, it’s important to continue taking your prescribed medications and not stop them without medical guidance. Always consult your pharmacist or GP if you have any questions or worries. They can provide advice tailored to your specific health needs and help you manage risks effectively.”