Diseases which cause for a long time is __________

Chronic diseases are those diseases that stay for a long time, sometimes even for the whole life, their symptoms are very mild, which are very difficult to catch and they damage the body gradually in many ways. These diseases mostly occur in older people or in those people whose routine is healthy, living such a disease may or may not be cured with medicines. But these diseases can also be controlled by eating healthy food and exercising regularly. Example of chronic disease is cancer, Diabetes, etc.