What are the causes of cancer?

Multiple: Depending on the site there is a combination of enviromental, genetic and familial factors involved.

Genetics: Generally speaking cancers are caused by our cells not genetically reproducing correctly. The cells become abnormal and replicate at an increased speed.

Cancer: If we knew the answer, we wouldn't need doctors or medicine. However, that said, from what we know, cancer is caused by an unfortunate set of interactions between environmental factors and individual human genetics.

DNA abnormalities: Most cancers are the result of abnormal dna. This can lead to cell growth that is uncontrolled.

Many causes: Risk and contributory factors to causing cancers would include genetics/family history of it, excessive exposure to agents- chemicals, pollutants, radiation, biologic, sometimes, we don't exactly know. Normal cells would grow, divide and die at an even pace but cancer cells would grow and divide at an alarmingly fast pace that it crowd out and impair the growth of surrounding normal cells.

Too many culprits!: 5-10% of the populations have a high risk of hereditary cancer. In addition, our gene is subject to thousands of hits every day, in the air, in the car....food, drinks, smoking, sun exposure, viruses..... to mention a few ! I am surprised that we are still alive! Count your blessings!