Type 2 diabetes is the most common type of diabetes and is caused by the body’s resistance to insulin and a decline of insulin production. Type 2 diabetes typically arises in adults (occurring most often in 45- to 64-year-olds); children and teenagers also may develop type 2 diabetes, especially if they are overweight and have a family history of diabetes. Treatment often requires medication (including pills, injectable medication, or insulin). The symptoms often are subtle, varying from none to tiredness (especially after a large meal), blurred vision, frequent urination at night, and dry, itchy skin.