Hi.... Diabetes can some time be asymptomatic, meaning it can be found only on blood test... There are a few symptoms which you can look for. Symptoms like excessive thirst, going for the washroom for the loo(urination) several times, not gaining weight inspite of increased food intake or losing weight without any cause, delay in wound healing, dizziness, blurring of vision... If you find any of these symptoms or if you have a strong family history of diabetes then get you blood test done... or get your blood checks done regularly to look for diabetes..