Cancer is a disease caused by uncontrolled cell growth that can affect any part of the body. It develops due to genetic mutations, lifestyle factors like smoking, or exposure to radiation. Common types include lung, breast, and skin cancer, each with varying symptoms and severity. Early detection is crucial, as it significantly improves survival rates. Treatment options range from surgery and chemotherapy to radiation therapy, depending on the stage and type. Maintaining a healthy lifestyle can help in prevention, while ongoing research aims to find better treatments and potential cures. Awareness and support play a vital role in helping patients and their families cope with the challenges of cancer.