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How does cancer progress in the body?

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Cancer occurs when normal cells undergo a transformation and grow and multiply without normal controls. Here are the cancer basics:

  • As the cells multiply, they form a mass called a tumor.
  • Tumors are cancerous only if they are malignant. This means that they encroach on and invade neighboring tissues (especially lymph nodes) because of their uncontrolled growth.
  • Tumors may also travel to remote organs via the bloodstream. This process of invading and spreading to other organs is called metastasis.
  • Tumors overwhelm surrounding tissues by invading their space and taking the oxygen and nutrients they need to survive and function.

SOURCES: 

National Cancer Institute. 

National Institutes of Health. 

WebMD Medical Reference from the American College of Physicians: “Section 12 VIII Lung Cancer.”

News release, FDA.

American Cancer Society.

American Lung Association. 

Reviewed by Carol DerSarkissian on February 05, 2019

SOURCES: 

National Cancer Institute. 

National Institutes of Health. 

WebMD Medical Reference from the American College of Physicians: “Section 12 VIII Lung Cancer.”

News release, FDA.

American Cancer Society.

American Lung Association. 

Reviewed by Carol DerSarkissian on February 05, 2019

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What are the three major types of skin cancer?

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THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.

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