Solution: Cancer is a disease involving abnormal cell growth with the potential to invade or spread to other parts of the body. Not all tumors are cancerous; benign tumors do not spread to other parts of the body. Possible signs and symptoms include a new lump, abnormal bleeding, a prolonged cough, unexplained weight loss, and a change in bowel movements etc. While these symptoms may indicate cancer, they may also occur due to other reasons. There are over 100 different types of known cancers that affect humans.