Tumors can vary in size from a small nodule to an outsized mass, counting on the sort, and that they can appear almost anywhere on the body. A tumor may be a mass or lump of tissue that will resemble swelling. Not all tumors are cancerous, but it's an honest idea to ascertain a doctor if one appears. In a healthy body, cells grow, divide, and replace one another within the body. As new cells form, the old ones die. When an individual has cancer, new cells form when the body doesn't need them. If there are too many new cells, a gaggle of cells, or tumors, can develop. Although some tumors are benign and contain noncancerous cells, others are malignant. Malignant tumors are cancerous, and therefore the cells can spread to other parts of the body. A tumor develops when cells reproduce too quickly.