Cancer

Cancer is a group of diseases that involve abnormal cell growth and have the potential to spread to other parts of the body. Cancer can affect any organ or tissue in the human body, and can cause various signs and symptoms, such as lumps, bleeding, weight loss, or pain. Cancer is caused by mutations in the DNA of cells, which can be inherited or acquired due to environmental factors, such as smoking, radiation, or viruses. Cancer can be diagnosed by various tests, such as blood tests, imaging, or biopsies. Cancer can be treated by various methods, such as surgery, chemotherapy, radiation, immunotherapy, or targeted therapy.