Tumors can be benign or malignant. Benign tumors are not cancer. They often can be removed and, in most cases, they do not come back. Cells in benign tumors do not spread to other parts of the body. Most important, benign tumors are rarely a threat to life.
Malignant tumors are cancer.
Cells in malignant tumors are abnormal and divide without control or order. These cancer cells can invade and destroy the tissue around them. This process, called metastasis, is how cancer spreads from the original tumor to form new tumors in other parts of the body. Cancer can cause a variety of symptoms. Change in bowel or bladder habits, A sore that does not heal, Unusual bleeding or discharge, Thickening or lump in the breast or any other part of the body, Indigestion or difficulty swallowing, Obvious change in a wart or mole, Nagging cough or hoarseness.