Non-communicable diseases (NCDs), also known as chronic diseases, are medical conditions that are not caused by infectious agents and are not transmissible between individuals. The document discusses three examples of NCDs - cardiovascular diseases, cancer, and chronic respiratory diseases - and provides details on their symptoms, risk factors, and potential complications. Cardiovascular diseases affect the heart and blood vessels and include conditions like heart disease and stroke. Cancer refers to diseases caused by uncontrolled cell growth and division. Chronic respiratory diseases impact the lungs, such as chronic obstructive pulmonary disease.