Genetics diseases occur when any single gene begins to mutate

Breast cancer is a major disease that occurs through genetics

Breast cancer mainly begins forming in the inner lining of milk ducts It begins by a parent who may or may not be affected by the disease and is passed through to a child. The affected individual experiences hair loss weight gain menopausal symptoms fatigue or pain. Though there is no known cure for breast cancer many scientist are working to find it.

Environmental relating to or arising from a person's surroundings.

Skin cancer
skin cancer is overexposure to ultraviolet radiation. It can spread to deeper layers and skin may have large moles. They use chemotherapy.

lifestyle they way a person is living his life.
Obesity
Obesity is caused when one is over-eating and not obtaining exercise. It may be hard to move around and they risk having a massive heart attack. The cure is exercis and diet