Cardinal signs are: increased thirst, increased hunger and increased urine output. If you notice these symptoms or if you have any risk factor like obesity, family history, alcohol intake......then it is recomended that you undergo the diagnostic tests i.e: fasting blood sugar, and glucose tolerance test
. Please consult your doctor to have these investigations done. Alos bear in mind that if you have risk factors you need to run these tests regularly so that any deviation can be detected early.