Pain isn't nice, but there are times when it’s necessary - If you don’t feel the pain you should, you’re at risk of doing yourself greater damage. If you feel pain you shouldn’t, that could the first signs of a deeper issue. 

Professor Rayaz Malik and Dr Ioannis Petropolous talk about their work on a new, non-invasive, inexpensive way of detecting early stages of neurodegeneration that could be as easy as an opticians appointment. 

Read their original research: https://doi.org/10.2337/dc20-2012