Cancer begins in cells, the building blocks that make up tissues. Tissues make up the organs of your body. Normally, cells grow and divide to form new cells as your body needs them. When cells grow old, they die, and new cells take their place.

Sometimes this orderly process goes wrong. New cells form when the body does not need them, and old cells do not die when they should. These extra cells can form a mass of tissue called a growth or tumor. Growths on the larynx also may be called nodules or polyps. Not all growths are cancer. Growths can be benign or malignant:

Benign growths are not cancer:

• They are rarely life-threatening.
• Usually, benign tumors can be removed, and they seldom grow back.
• Cells from benign tumors do not spread to tissues around them or to other parts of the body.

Malignant growths are cancer:

• They are generally more serious and may be life-threatening.
• Malignant tumors usually can be removed, but they can grow back.
• Cells from malignant tumors invade and damage nearby tissues and organs. Also, cancer cells can break away from a malignant tumor and enter the bloodstream or lymphatic system. That is how cancer cells spread from the original cancer (the primary tumor) to form new tumors in other organs. The spread of cancer is called metastasis. Different types of cancer tend to spread to different parts of the body.

Cancer of the larynx also may be called laryngeal cancer. It can develop in any part of the larynx. Most cancers of the larynx begin in the glottis. The inner walls of the larynx are lined with cells called squamous cells. Almost all laryngeal cancers begin in these cells. These cancers are called squamous cell carcinomas.

If cancer of the larynx spreads (metastasizes), the cancer cells often spread to nearby lymph nodes in the neck. The cancer cells can also spread to the back of the tongue, other parts of the throat and neck, the lungs, and other parts of the body. When this happens, the new tumor has the same kind of abnormal cells as the primary tumor in the larynx. For example, if cancer of the larynx spreads to the lungs, the cancer cells in the lungs are actually laryngeal cancer cells. The disease is called metastatic cancer of the larynx, not lung cancer. It is treated as cancer of the larynx, not lung cancer. Doctors sometimes call the new tumor "distant" disease.

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