Over time, elevated glucose levels can lead to severe complications in adults who have type 1 diabetes. Some of the health problems that result from high blood sugar include:
Nerve damage, which causes pain, tingling, or numbness in the extremities
Eye damage leading to vision problems and eventual blindness
Cardiac issues such as heart attack and stroke because of blood vessel damage
Kidney damage and eventual kidney failure
Erectile dysfunction
Non-healing wounds on the extremities that eventually lead to foot or leg amputation