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Everyday habits that may lead to cancer

These seemingly harmless behaviors may raise your odds of developing several different types of the disease.

Updated on October 31, 2025

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While healthy eating and quitting smoking are critical to good health, they aren’t the only lifestyle habits that matter. There are many seemingly harmless things you may do every day that could affect your well-being—and increase your risk for cancer.

Here are a few habits you may want to work on, plus tips on how to make changes.

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Sitting too much

A long commute or binge watching your favorite show: It may not seem damaging, but over time it can affect your health. Many studies have found that sedentary behavior—such as prolonged sitting—is linked to an increased risk of several different cancers, including cancer of the:

  • Breast
  • Ovaries, the female reproductive organs that store and release eggs
  • Endometrium, the lining of the womb
  • Colon (large intestine) and rectum
  • Prostate

This is partly because excess sitting can lead to widespread inflammation, a cancer risk factor. Too much time spent seated also means a person isn’t getting much physical activity, which plays a role in obesity. Excess weight is a risk factor for several cancers.

As you are able, try to get as much regular physical activity as possible during your day. If you’re watching TV, get up every few minutes to take a few steps. While experts recommend at least 150 minutes of moderate activity each week spread across several days, any movement helps.

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Being constantly stressed—and not taking steps to relieve it

Stress doesn’t directly cause cancer. But constant, long-term stress can create conditions in your body that set the stage for disease. It can affect your immune system, for example, making you more susceptible to many different illnesses, including certain cancers.

People who are chronically over-stressed may also engage in unhealthy habits. These include overeating, not exercising, smoking, and drinking too much alcohol, all of which have been linked to different types of cancer. Taking steps to reduce stress in the moment and over the long term can help to offset these habits. Consider these strategies:

  • Get regular physical activity; exercise is a proven stress reliever with wide health benefits.
  • Practice deep breathing, mindfulness meditation, or other relaxation techniques.
  • Make it a point to socialize regularly; talk to friends and loved ones.
  • Prioritize getting seven to nine hours of healthy sleep each night. Practicing good sleep hygiene can help.
  • Seek immediate stress relievers. Read, listen to music, or write your worries in a journal.

Speak with a healthcare provider about other ways to ease stress that work for your health and lifestyle.

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Eating sugary foods and drinks

Many foods have added sugars, or sugar that’s added during processing. These include packaged foods like cookies, cakes, and candies, as well as sweetened soda, tea, and fruit drinks. Too much added sugar can affect your health for many reasons. It can cause weight gain and increase your risk for a range of health problems, including cancer.

Added sugar affects certain hormones in the body. One of these is insulin. Insulin helps control levels of sugar in the blood. Another is estrogen, which can cause some types of cancer cells to grow. Too much insulin and estrogen in the body may lead to issues that can increase the risk of cancer.

One immediate, impactful way to cut back on added sugar is to avoid drinking sugar-loaded beverages. A 20-ounce bottle of regular cola alone contains 65 grams of sugar. That’s about twice as much as the American Heart Association says you should get in a single day. Instead of sweet soda, drink water or unsweetened tea. Or try sparkling water (seltzer) mixed with a little bit of fresh fruit.

Slideshow sources open slideshow sources

Lynch BM. Sedentary behavior and cancer: a systematic review of the literature and proposed biological mechanisms. Cancer Epidemiol Biomarkers Prev. 2010 Nov;19(11):2691-709.
Ihira H, Sawada N, et al. Occupational sitting time and subsequent risk of cancer: The Japan Public Health Center-based Prospective Study. Cancer Sci. 2020 Mar;111(3):974-984.
Hermelink R, Leitzmann MF, et al. Sedentary behavior and cancer-an umbrella review and meta-analysis. Eur J Epidemiol. 2022 May;37(5):447-460.
Office of Disease Prevention and Health Promotion. Physical Activity Guidelines for Americans. 2018.
Mayo Clinic. Stress Relievers: Tips to Tame Stress. August 3, 2023.
Cancer Research UK. Sugar and Cancer – What You Need to Know. August 16, 2023.
American Institute for Cancer Research. The Sugar and Cancer Connection. January 7, 2016.
Epner M, Yang P, et al. Understanding the Link between Sugar and Cancer: An Examination of the Preclinical and Clinical Evidence. Cancers (Basel). 2022 Dec 8;14(24):6042.
Anil A, Raheja R, et al. Uncovering the Links Between Dietary Sugar and Cancer: A Narrative Review Exploring the Impact of Dietary Sugar and Fasting on Cancer Risk and Prevention. Cureus. 2024 Aug 21;16(8):e67434.
American Heart Association. How Much Sugar Is Too Much? September 23, 2024.

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