Chronic diseases, also known as noncommunicable diseases, are long-term diseases caused by a combination of genetic, physiological, environmental, and behavioural factors. Noncommunicable diseases (NCDs) claim the lives of 41 million people each year, accounting for 71% of all deaths worldwide. More than 15 million people between the ages of 30 and 69 die each year from an NCD, with 85 percent of these "premature" deaths occurring in low- and middle-income countries. Low- and middle-income nations account for 77% of all NCD mortality. Tobacco use, physical inactivity, an unhealthy diet, and the harmful use of alcohol are all modifiable behaviours that increase the risk of NCDs. Although NCDs cause the majority of morbidity and mortality in adults, risk factors are introduced early in life. As a result, NCDs and their risk factors are extremely important to young people. NCDs are rapidly spreading over the world and have reached epidemic levels in many countries, owing to globalisation, industrialisation, and growing urbanization, as well as demographic and lifestyle changes.