Cancer is the general class of diseases caused by the body’s own cells reproducing too rapidly. The dividing cells usually create a solid tumor from a mass of body cells, but some types of cancer cause too many cells circulating throughout the body rather than a lump (e.g ...

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Introduction: Cancer

What is cancer? Cancer occurs when cells in one part of the body, such as the colon, grow abnormally or out of control. The cancerous cells sometimes spread to other parts of the body, such as the liver. Cancer is ...1

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Symptoms of Cancer

Spotting signs of cancer Changes to your body's normal processes or unusual, unexplained symptoms can sometimes be an early sign of cancer. Symptoms that need to be checked by a doctor include:

  • a lump that suddenly appears on your body ...
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Complications of Cancer

Side Effects: Cancer treatments can cause side effects—problems that occur when treatment affects healthy tissues or organs. Side effects vary from person to person, even among those receiving the same treatment. Some people have very few side effects while ...2

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Causes of Cancer

What are the possible causes of cancer in children? The causes of most childhood cancers are not known. About 5 percent of all cancers in children are caused by an inherited mutation (a genetic mutation that can be passed from ...3

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Causes List for Cancer

Some possible causes of Cancer or similar disorders may include:4

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Types of Cancer

Some of the more common and better known types of cancer include:

Cancers that are not made of single, solid tumors include:

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Types of Cancer

Only about 5 to 10 percent of cancers are caused by harmful mutations that are inherited from a person’s parents. In families with an inherited cancer-causing mutation, multiple family members will often develop the same type of cancer ...5

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Diagnosis of Cancer

Genetic Test Results: Genetic tests are usually requested by a person’s doctor or other health care provider. Genetic counseling can help people consider the risks, benefits, and limitations of genetic testing in their particular situations. The results of genetic ...6

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Genetics of Cancer

Genetic Changes and Cancer: Cancer is a genetic disease—that is, cancer is caused by certain changes to genes that control the way our cells function, especially how they grow and divide. These changes include mutations in the DNA that ...7

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Risk Factors for Cancer

Do you know people who’ve smoked their whole lives and thrived well into old age without any sign of lung cancer? Or someone who never seemed to go near fruits and veggies but lived a long, full life? When ...8

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Misdiagnosis: Cancer

Cancer is difficult to diagnose by its very nature. There are literally hundreds of types. Many types of tumors are hidden from view and not obvious even to the patient until late in its progression. Pain is often a late ...

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Treatments: Cancer

Questions To Ask Your Doctor: If you’ve been diagnosed with cancer, consider asking your doctor some of these questions before choosing a treatment plan:

  • What are the ways to treat my type and stage of cancer?
  • What are the ...
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Prevention of Cancer

Cancer prevention is action taken to lower the chance of getting cancer. In 2014, about 1.6 million people will be diagnosed with cancer in the United States. In addition to the physical problems and emotional distress caused by cancer ...9

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Research for Cancer

NCI’s Investment in Pediatric Cancer Research To learn more about the research NCI conducts and supports in pediatric cancer, visit the NCI Funded Research Portfolio (NFRP). The NFRP includes information about research grants, contract awards, and intramural research projects ...10

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  1. Source: NIDDK (NIH): health-information/ health-topics/ weight-control/ health_risks_being_overweight/ Pages/ health-risks-being-overweight.aspx
  2. Source: NCI (NIH): about-cancer/ treatment/ side-effects
  3. Source: NCI (NIH): types/ childhood-cancers/ child-adolescent-cancers-fact-sheet
  4. Source: Algorithmically Generated List
  5. Source: NCI (NIH): about-cancer/ causes-prevention/ risk/ myths
  6. Source: NCI (NIH): about-cancer/ causes-prevention/ genetics
  7. ibid.
  8. Source: NIH News in Health (NIH): 2008/ February/ docs/ 01features_01.htm
  9. Source: NCI (NIH): about-cancer/ causes-prevention/ patient-prevention-overview-pdq
  10. Source: NCI (NIH): research/ progress/ snapshots/ pediatric

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Note: This site is for informational purposes only and is not medical advice. See your doctor or other qualified medical professional for all your medical needs.