👉 Cancer is a type of disease that usually affects cells, called tissues or organs in the body. It's caused by abnormal growth and division of cells, which can lead to mutations in DNA. Cancerous cells can spread through the bloodstream, lymphatic system, or other parts of the body, where they can invade surrounding tissue and grow larger and more difficult to treat. There are two main types of cancer: benign (non-cancerous) and malignant (cancerous). Benign tumors