Cancer is not one disease but rather a group of diseases. All types of cancer involve cells that have changed so that they copy themselves at a much faster rate than normal. In many instances, these quickly dividing cells form a mass called a tumor. In some instances, cancer cells have the ability to invade neighboring tissue and spread to other areas in the body. When this occurs, the cancer is considered malignant. Before the cells have the ability to invade surrounding tissues, the tumor is considered to be benign. Cancer can cause pain and discomfort and can cause organs to not function properly resulting in a variety of other symptoms.
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