Chronic diseases tend to become more common with age. The leading chronic diseases in developed countries include (in alphabetical order) arthritis, disorder like heart attacks and stroke, cancer like breast and Carcinoma, diabetes, epilepsy and seizures, obesity, and oral health problems. Chronic conditions are often related to non-communicable diseases which are distinguished by their non-infectious causes. Some chronic conditions though, are caused by transmissible infections like HIV/AIDS.