There is a long list of medical conditions drivers must tell the DVLA when applying for their licence. Failure to do so could land them in hot water, although there are exceptions specific to different medical conditions. From cancer to neurological disorders, it's crucial for drivers to recognise the significance of reporting these conditions to authorities. Diabetes For diabetes, it's essential to keep on the side of caution if: Your insulin therapy extends (or is expected to extend) beyond three months postpartum.