Cancerous tumors can be sneaky little things. Tumors are born at the cellular level, when mutations cause healthy cells to turn into diseased ones that multiply out of control. Cancer cells grow and divide rapidly to form new tumor growths, which can invade nearby tissues and break off from a primary tumor to metastasize (spread) throughout the body.
This new “bad” tissue can put pressure on the surrounding healthy cells. It can cause an obstruction, or it can invade new areas and block or damage important structures like nerves, blood vessels, lymph nodes, ligaments, etc., which poses a threat to the patient’s health.