Ask AI: What is cause of cancer?

Cancer is caused by changes (mutations) in the DNA within cells, which can lead to uncontrolled cell growth and the formation of tumors. These changes may be inherited, develop over time due to normal wear-and-tear, or result from exposure to certain risk factors. Some common risk factors include: 1. Tobacco use: Smoking cigarettes or using other types of tobacco significantly increases the risk of developing various cancers. 2. Age: The risk of developing cancer generally increases as people get older, due in part to accumulated mutations in cells over time. 3. Exposure to harmful substances: Chemicals, radiation, or other carcinogens - found in workplaces, the environment, or certain products - can contribute to the development of cancer. 4. Unhealthy diet and lack of physical activity: A diet high in processed and red meats, excess alcohol consumption, and a sedentary lifestyle can increase the risk of some types of cancer. 5. Infections: Certain viruses and bacteria can lead to cancer, such as human papillomavirus (HPV) and hepatitis B and C. 6. Family history and genetic predisposition: Some people have inherited gene mutations that increase their risk of developing specific types of cancer. 7. Hormonal factors: Hormone imbalances may contribute to the development of certain types of cancer, such as breast, ovarian, or prostate cancer. It's important to note that not all cancers have a clear cause, and many times, multiple factors contribute to an individual's cancer risk. Engaging in healthier lifestyle choices, such as maintaining a balanced diet, exercising regularly, and avoiding tobacco and excessive alcohol use, can help reduce the risk of developing cancer.