Cancer
Cancer is a disease in which some of the body's cells grow out of control and spread to other parts of the body.
Cancer can start almost anywhere in the human body, which is made up of trillions of cells. Normally, human cells grow and multiply (through a process called cell division) to make new cells when the body needs them. When cells become old or damaged, they die and new cells take their place.
Sometimes this orderly process goes awry, and abnormal or damaged cells grow and multiply when they shouldn't. These cells can form tumors, which are lumps of tissue. Tumors can be cancerous or non-cancerous (benign).
Cancerous tumors spread to or invade nearby tissues and may travel to other parts of the body to form new tumors (a process called metastasis). Cancerous tumors are also called malignant tumors. Many cancers form solid tumors, but cancers of the blood, such as leukemia, usually do not.
Benign tumors do not spread or invade nearby tissues. When removed, benign tumors usually don't grow back, while cancerous tumors sometimes do. However, benign tumors can sometimes be quite large. Some can cause serious symptoms or be life-threatening, such as benign tumors in the brain.
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