diabetes is a disorder than a disease. it is caused by the defeciency or ineffeciency of the normal hormone insulin in the body. more so it will be asymptomatic,some of the warning signs which are considered as symptoms are, increased urination, increased consumption of water, increased thirst, easy tierdness, delay in the wound healing time, increased susceptibility to the infections making you to fall sick frequently. it can be detected by the blood glucose test.