People with certain health conditions can be especially vulnerable in hot weather11:23, 26 Jun 2026A doctor has issued a heatwave anyone living with certain health conditions. According to the expert, the hot weather could be particularly dangerous to you.‌This week, the UK has experienced scorching temperatures of up to 36C. And the heat is set to persist, with the Met Office issuing a red warning for extreme heat for Friday in the UK.‌With this in mind, Doctor Amir Khan shared a video on his Instagram account warning of the health risks. Dr Amir, who is best known for his appearances on ITV, said: “We are in the middle of a heatwave.‌“Hot weather can actually make some medical conditions worse. So here are five common ones to watch out for in this hot weather.”Content cannot be displayed without consentAsthma and lung conditionsDr Amir said: “Hot and can irritate the airways and higher levels of pollution and pollen during warm weather can trigger symptoms. If you have asthma or COPD, make sure you're taking your preventer inhalers regularly and routinely and always carry your inhalers with you just in case.”‌Heart disease and high blood pressureHe explained: “When we're hot, our blood vessels widen to help us cool down. This can cause blood pressure to drop, making some people feel dizzy, faint, or unwell.“Your heart also has to work harder to keep your body cool. Stay well hydrated, avoid strenuous activity during the hottest part of the day, and take things a little slower than usual.”‌Diabetes“Did you know, heat can affect blood sugar levels, even alter how insulin is absorbed,” he said. “On top of that, dehydration can make glucose levels harder to control.“Drink plenty of fluids, monitor your blood sugars more closely than you normally do and store insulin according to the manufacturer's instructions - don't let it get too hot.”Kidney diseaseDr Amir explained: “Now your kidneys rely on a good supply of fluid to work properly. When you become dehydrated through sweating, kidney function can worsen.‌“This is particularly important if you're older or taking medicines such as water tablets. Keep sipping water throughout the day, rather than waiting until you feel thirsty.”Migraines and headachesHe said: “Yes, heat and dehydration are major headache triggers. If you're prone to migraines, try to stay cool.‌“Drink plenty of water, and don't skip meals as low blood sugar can also contribute on top of that heat.”Medications and heatHe added: “Certain medications can make you feel more vulnerable to the heat as well, including water tablets, some antidepressants, and some antihistamines.Article continues below“So the key message is stay hydrated, stay in the shade during the hottest part of the day, always wear your SPF, keep your home cool, and check in on old relatives, neighbours, and anyone with long-term health conditions that they might be worried about.”