Our 24/7 cancer helpline provides information and answers for people dealing with cancer. We can connect you with trained cancer information specialists who will answer questions about a cancer diagnosis and provide guidance and a compassionate ear.
Our highly trained specialists are available 24/7 via phone and on weekdays can assist through video calls and online chat. We connect patients, caregivers, and family members with essential services and resources at every step of their cancer journey. Ask us how you can get involved and support the fight against cancer. Some of the topics we can assist with include:
For medical questions, we encourage you to review our information with your doctor.
A risk factor is anything that increases a person's chances of getting a disease such as cancer. Different cancers have different risk factors.
In older adults, many cancers are linked to lifestyle-related risk factors such as smoking, being overweight, eating an unhealthy diet, not getting enough exercise, and drinking too much alcohol. Exposures to things in the environment, such as radon, air pollution, asbestos, or radiation during medical tests or procedures, also play a role in some adult cancers. These types of risk factors usually take many years to influence cancer risk, so they are not thought to play much of a role in cancers in children or teens.
Cancer occurs as a result of changes (mutations) in the genes inside our cells. Genes, which are made of DNA, control nearly everything our cells do. Some genes affect when our cells grow, divide into new cells, and die. Changes in these genes can cause cells to grow out of control, which can sometimes lead to cancer.
Some people inherit gene mutations from a parent that increase their risk of certain cancers. In people who inherit such a mutation, this can sometimes lead to cancer earlier in life than would normally be expected. But most cancers are not caused by inherited gene changes.
We know some of the causes of gene changes that can lead to adult cancers (such as the lifestyle-related and environmental risk factors mentioned above), but the reasons for gene changes that cause most cancers in teens are not known. Many are likely to just be random events that sometimes happen inside a cell, without having an outside cause.
Still, there are some known causes of cancer in teens. For instance:
Still, these and other known risk factors probably account for only a small portion of cancers in teens overall.
Our team is made up of doctors and oncology certified nurses with deep knowledge of cancer care as well as journalists, editors, and translators with extensive experience in medical writing.
Bleyer A. Young adult oncology: The patients and their survival challenges. CA Cancer J Clin. 2007;57:242-255.
Last Revised: October 16, 2019
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