What Are The Signs Of Diabetes? Know If You Have Diabetes How to know if you have diabetes? What are the signs of diabetes? Well, the typical diabetes warning signs begin with blood glucose levels shooting up. Oftentimes, the early indicators are so subtle that you don’t pick them up. This is especially true for people with type 2 diabetes. It is the long-term complications that become the warning signs that someone has it. In case of type 1 diabetes, symptoms often appear between a few days to a few weeks. Moreover, their severity has increased to a significant extent.