Cancer is not a unmarried sickness. It's a collection of illnesses characterized via their potential to cause cells to alternate abnormally and develop out of control. Most sorts of cancer shape a tumor, a lump or mass of cancerous cells. Cells from a tumor might also damage away and travel to different parts of the frame, wherein they can settle and multiply. This spreading procedure is referred to as metastasis. New cancers which have broken off and unfold from the authentic tumor are referred to as metastases. Not all tumors are cancerous or malignant; a few are benign (non-malignant), do not spread, and aren't existence-threatening. And some cancers don't form masses or lumps, such as those that have an effect on the blood, which includes leukemia.