Type 2 diabetes (T2D), formerly known as adult-onset diabetes, is a form of diabetes mellitus that is characterized by high blood sugar, insulin resistance, and relative lack of insulin.[6] Common symptoms include increased thirst, frequent urination, fatigue and unexplained weight loss.[3] Symptoms may also include increased hunger, having a sensation of pins and needles, and sores (wounds) that do not heal.[3] Often symptoms come on slowly.[6] Long-term complications from high blood sugar include heart disease, stroke, diabetic retinopathy which can result in blindness, kidney failure, and poor blood flow in the limbs which may lead to amputations.[1] The sudden onset of hyperosmolar hyperglycemic state may occur; however, ketoacidosis is uncommon.[4][5]

Reference
Wiki: Type 2 diabetes