Breast cancer can be either invasive or non-invasive, originating in breast cells. It usually begins in the ducts or lobules. Symptoms may include breast lumps, changes in breast size or form, skin dimpling, nipple inversion, or discharge. Mammograms aid in early detection. Surgery, chemotherapy, radiation, hormone treatment, and targeted therapy are all used to treat the condition. The prognosis varies according to stage and type. Smoking is a common risk factor for lung cancer, which begins in lung cells. It is classified as small cell lung cancer (SCLC) or non-small cell lung cancer (NSCLC). Symptoms may include a chronic cough, chest pain, hoarseness, weight loss, and difficulty breathing. Imaging studies and biopsies are used to determine the diagnosis. Surgery, chemotherapy, radiation, targeted therapy, and immunotherapy are some of the treatment options. The prognosis is determined by the stage of cancer at the time of diagnosis and its type. Prostate cancer is more commonly found in elderly men and affects the prostate gland. It typically grows slowly and does not cause much harm, although some varieties can be aggressive. Symptoms include difficulty urinating, blood in urine or semen, pelvic discomfort, and erectile dysfunction. A PSA blood test and a digital rectal exam are used during screening. Treatment options include active surveillance, surgery, radiation, hormone treatment, chemotherapy, and immunotherapy, which are determined by the stage and severity of the malignancy. Stomach cancer, also known as gastric cancer, starts in the cells that line the stomach. Indigestion, bloating, moderate nausea, and loss of appetite are common symptoms in the early stages. Advanced stages may include blood in the stool or vomit, stomach pain, and weight loss. Endoscopy, imaging studies, and biopsies are used to determine the diagnosis. Surgery, chemotherapy, radiation, targeted therapy, and immunotherapy are some of the treatment options. The prognosis is determined by the stage at when the tumor was diagnosed as well as its characteristics. Although awareness, early identification, and breakthroughs in treatment have improved results, many malignancies continue to pose major health risks, emphasizing the significance of frequent screenings and a healthy lifestyle.