Adenocarcinoma is a type of cancer that originates in glandular tissues, which are responsible for producing fluids like mucus or hormones. This cancer can develop in various organs, including the lungs, breast, prostate, and pancreas. It often starts in the lining of these organs and can spread to nearby tissues or other parts of the body if not detected early. Symptoms of adenocarcinoma vary depending on the location but may include unexplained weight loss, persistent cough, or changes in bowel habits. Early diagnosis and treatment are crucial for improving outcomes, and options may include surgery, chemotherapy, or radiation therapy.