A carcinogenic refers to anything that promotes or aggravates the appearance of a cancerous disease. It may be a chemical or radiological (X-ray
) agent, a risk factor (hereditary trait), exposure to certain agents in the work environment, etc. There exist a wide variety of carcinogenic factors. However, it is important to distinguish external factors, such as chemical products, from internal factors, such as hereditary phenomena, disorders and disturbances within the organism.