Someone who is predisposed to a disease is more likely than other people to develop the disease in the future.
For example, someone who is genetically predisposed to develop Alzheimer's has a genetic makeup that increases their risk of developing this disease. A predisposition will not in itself cause the disease, but the disease may eventually be triggered by particular environmental or lifestyle factors, such as tobacco smoking or diet. Genetic testing is able to identify individuals who are genetically predisposed to certain diseases.