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Cancer begins in your cells, which are the building blocks of your body. Normally, your body forms new cells as you need them, replacing old cells that die. Sometimes this process goes wrong. New cells grow even when you don't need them, and old cells don't die when they should. These extra cells can form a mass called a tumor. Tumors can be benign or malignant. Benign tumors aren't cancer while malignant ones are. Cells from malignant tumors can invade nearby tissues. They can also break away and spread to other parts of the body.

Cancer is not just one disease but many diseases. There are more than 100 different types of cancer. Most cancers are named for where they start. For example, lung cancer starts in the lung, and breast cancer starts in the breast. The spread of cancer from one part of the body to another is called metastasis. Symptoms and treatment depend on the cancer type and how advanced it is. Most treatment plans may include surgery, radiation and/or chemotherapy. Some may involve hormone therapy, biologic therapy, or stem cell transplantation.

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Illustration of cancer cells
Results 1 - 10 of 8,753 for cancer
  1. Cancer (National Library of Medicine)  
    Cancer begins in your cells, which are the building blocks of your body. Normally, your body forms ... be benign or malignant. Benign tumors aren't cancer while malignant ones are. Cells from malignant tumors ...
  2. Throat Cancer (National Library of Medicine)  
    Throat cancer is a type of head and neck cancer. Throat cancer has different names, depending on what part of ...
  3. Intestinal Cancer (National Library of Medicine)  
    ... connects your stomach to your large intestine. Intestinal cancer is rare, but eating a high-fat diet ... increase your risk. Possible signs of small intestine cancer include Abdominal pain Weight loss for no reason ...
  4. Nasal Cancer (National Library of Medicine)  
    ... the way to your throat as you breathe. Cancer of the nasal cavity and paranasal sinuses is ... be like those of infections. Doctors diagnose nasal cancer with imaging tests, lighted tube-like instruments that ...
  5. Bladder Cancer (National Library of Medicine)  
    ... in your lower abdomen that stores urine. Bladder cancer occurs in the lining of the bladder. It is the sixth most common type of cancer in the United States. Symptoms include Blood in ...
  6. Benign Tumors (National Library of Medicine)  
    ... either benign or malignant. Benign tumors aren't cancer. Malignant ones are. Benign tumors grow only in ... tumors usually don't grow back. NIH: National Cancer Institute
  7. Cancer--Living with Cancer (National Library of Medicine)  
    Cancer is common. Half of all men and a third of women will get a diagnosis of cancer in their lifetime. Many people with cancer do survive. Millions of Americans alive today have ...
  8. Colorectal Cancer (National Library of Medicine)  
    ... rectum are part of the large intestine. Colorectal cancer occurs when tumors form in the lining of ... men and women. The risk of developing colorectal cancer rises after age 50. You're also more ...
  9. Lung Cancer (National Library of Medicine)  
    Lung cancer is one of the most common cancers in the world. It is a leading cause of cancer death in men and women in the United States. Cigarette smoking causes most lung cancers. The more cigarettes you smoke per day and ...
  10. Oral Cancer (National Library of Medicine)  
    Oral cancer can form in any part of the mouth or throat. Most oral cancers begin in the tongue and in the floor of the mouth. Anyone can get oral cancer, but the risk is higher if you are ...
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