There are three differnent types of diabetes:
Type 1 diabetes - this occurs when the pancreas stops producing insulin.
Type 2 diabetes - the pancreas does produce insulin, just not enough. Either that, or the body does not use the insulin effectively.
Gestational diabetes - this is a temporary condition that occurs during pregnancy.
If improperly treated, or left untreated, diabetes can lead to:
Kidney disease
Heart disease
Eye disease
Nerve damage
Problems with erection (impotence)
Frequent urination
Weight gain/loss
Fatigue or lack of energy
Unusual thirst
Cuts and bruises that heal slowly
Blurred vision
Frequent or recurring infections
Tingling or numbness in the hands or feet
Trouble getting or maintaining an erection
However, many people who have type 2 diabetes may not show any symptoms.