Type 1 diabetes may be passed on to the next generation, but it is not absolutely 100% hereditary. There are many causes of type 1 diabetes, including genetic inheritance. If one parent has type 1 diabetes, there is a probability that the child will develop type 1 diabetes, but the risk of developing the disease is low, only 2% to 6%. It is also associated with viral infections, autoimmunity, and exposure to toxic chemicals, which lead to the destruction of pancreatic beta cells, triggering type 1 diabetes. Most type 1 diabetes starts in children or adolescents, with a small percentage not developing until adulthood. The onset of type 1 diabetes in adolescents is more rapid and the symptoms are more pronounced. Without proper treatment, the consequences can be very serious, most commonly leading to diabetic ketoacidosis. Type 1 diabetes has a genetic predisposition, and people with a family history of diabetes should actively consult their doctors.