Thunderstorms across the UK may worsen symptoms for millions of people with asthma, as the Met Office forecasts thundery showers amid a heatwave. The NHS warns that thunderstorm conditions can trigger sudden, serious asthma episodes, urging those affected to keep inhalers close and seek medical advice if needed.
Thunderstorm Asthma Risk
Asthma and Lung UK reports that 7.2 million people in the UK live with asthma, about 8 in every 100 people. Thunderstorm asthma can cause breathlessness, wheezing, and coughing. The charity notes that younger adults under 30 are disproportionately affected. People with both asthma and hay fever, those not managing their asthma well, or those undiagnosed are more likely to experience symptoms.
Weather Forecast and Health Advice
The Met Office predicts temperatures will quickly rise, with thundery showers for some areas. Record-breaking June temperatures and high humidity are expected. The NHS advises using inhalers more frequently, consulting a pharmacist, GP, or NHS 111 if symptoms worsen. Asthma and Lung UK recommends calling their helpline at 0300 222 5800 for support.
Heatwave Precautions
Schools in England and Wales are closing early due to 35°C heat. London may reach 36°C on Wednesday, with the South East hitting 39°C by Thursday. Met Office amber and red heat warnings cover nearly 100 areas. Residents are advised to stay out of the sun between 11am and 3pm. The exact cause of thunderstorm asthma is not fully understood, but research links it to elevated pollen and pollution particles.



