What is cancer mainly caused by?

Cancer is a complex disease that can be caused by a variety of factors. Gene mutations are a significant factor in the development of cancer, and these mutations can be either inherited or acquired after birth. While inherited mutations are passed down from parents, the majority of gene mutations occur after birth and are not inherited. There are several forces that can cause these mutations, including: 1. Smoking: A well-known cause of various types of cancer, including lung, throat, and mouth cancers. 2. Radiation: Exposure to high levels of radiation, such as from medical treatments or environmental sources, can increase the risk of cancer. 3. Viruses: Certain viruses, like human papillomavirus (HPV) and hepatitis B and C, can lead to genetic changes that result in cancer. 4. Carcinogens: These are cancer-causing chemicals found in tobacco smoke, asbestos, and certain industrial chemicals, among others. 5. Obesity: Excess body weight has been linked to an increased risk of several types of cancer. 6. Hormones: Hormonal imbalances or exposure to certain hormones can contribute to the development of some cancers. 7. Chronic Inflammation: Persistent inflammation can lead to DNA damage and an increased risk of cancer. 8. Lack of Exercise: A sedentary lifestyle can contribute to obesity and other factors that increase cancer risk. It's important to note that not all mutations lead to cancer, and not all cancers are the result of these factors. Cancer development is a multi-step process that often involves a combination of genetic, environmental, and lifestyle factors.

Gene mutations that occur after birth. Most gene mutations occur after you're born and aren't inherited. A number of forces can cause gene mutations, such as smoking, radiation, viruses, cancer-causing chemicals (carcinogens), obesity, hormones, chronic inflammation and a lack of exercise.