If your cheeks are subtly warmer than is usual, it could be a sign of rising blood pressure that could be detected by artificial intelligence. Little changes like this in the heat patterns of people’s faces could also flag certain other medical conditions, such as diabetes and fatty liver disease and even be used to estimate age.

Jing-Dong Han at Peking University in Beijing, China, and her colleagues used a commercial, hand-held thermal imager to capture facial heat readings and 2D images of more than 2800 Han Chinese volunteers during their annual health check-ups at hospitals in Jidong between 2020 and 2022. The temperature of your face could help diagnose medical conditions | New Scientist