Women develop colon cancer at nearly the same rate as men, and the disease behaves the same way in both
Colon cancer is not a male-only disease. Women account for roughly 40 to 45 percent of all colon cancer cases in the United States. The cancer grows in the large intestine and can occur at any age, though risk rises significantly after age 50. The cells involved, the way the disease spreads, and the treatment options are the same regardless of sex.
What differs is that women are sometimes diagnosed later than men. This happens partly because symptoms can be mistaken for other conditions—like hemorrhoids, irritable bowel syndrome, or menstrual-related issues—and partly because screening rates have historically been lower in women. Catching colon cancer early, before it spreads, makes treatment more straightforward and outcomes better.
Key Takeaways
- Women develop colon cancer at rates comparable to men, and the disease itself does not differ by sex.
- Screening usually begins at age 45 for average-risk adults, though your doctor may recommend earlier screening based on family history or other factors.
- Symptoms in women—blood in stool, changes in bowel habits, abdominal pain, unexplained weight loss—can be confused with other conditions, so reporting them to your doctor matters.
- Women with a family history of colon cancer, inflammatory bowel disease, or certain genetic syndromes face higher risk and may need earlier or more frequent screening.
Symptoms women should report to their doctor
The warning signs of colon cancer are the same for women as for men. Blood in the stool is the most common symptom—it may appear bright red on toilet paper or mixed into the stool itself. Some women mistake this for hemorrhoids and delay reporting it. Other symptoms include persistent changes in bowel habits (constipation or diarrhea lasting more than a few weeks), abdominal cramping or pain, feeling like you need to have a bowel movement but cannot, and unexplained weight loss.
Because these symptoms overlap with many other conditions—irritable bowel syndrome, diverticulosis, menstrual cramping, or food sensitivities—women sometimes wait longer to mention them to a doctor. If a symptom lasts more than two weeks, report it. Your doctor can order tests to rule out colon cancer and identify what is actually causing the problem.
Screening recommendations for women
Screening guidelines recommend that women at average risk begin colon cancer screening at age 45. This is a change from the previous recommendation of age 50, made because colon cancer rates in younger adults have been rising. Screening methods include colonoscopy (a camera inserted through the rectum to view the entire colon), flexible sigmoidoscopy (which views only the lower portion), fecal immunochemical testing (a stool test), and CT colonography (a CT scan of the colon).
A colonoscopy is the most common screening method because it allows the doctor to remove polyps—growths that can become cancerous—during the same procedure. If you have no polyps and no family history of colon cancer, you typically repeat screening every 10 years. If polyps are found and removed, your doctor will recommend a follow-up schedule based on what was found.
Your individual screening timeline may differ. Women with a family history of colon cancer, a personal history of inflammatory bowel disease (Crohn's disease or ulcerative colitis), or certain genetic syndromes should discuss screening with their doctor, as earlier or more frequent screening may be recommended.
Risk factors that apply to women
Some risk factors for colon cancer affect women and men equally: age over 50, a family history of colon cancer, inflammatory bowel disease, obesity, smoking, heavy alcohol use, and a diet high in red or processed meat. A few factors are specific to women or more common in women. Hormone replacement therapy (HRT) used during menopause may slightly lower colon cancer risk, though this is not a reason to take HRT for cancer prevention. Pregnancy and breastfeeding may also lower risk, though the research is still developing.
Women with Lynch syndrome (hereditary nonpolyposis colorectal cancer) or familial adenomatous polyposis have a much higher lifetime risk of colon cancer and need screening starting in childhood or early adulthood. If colon cancer runs in your family, ask your doctor whether genetic testing makes sense for you.
How colon cancer is diagnosed in women
If screening finds a polyp or abnormal tissue, your doctor will perform a biopsy—removing a small sample of cells to examine under a microscope. A biopsy is the only way to confirm colon cancer. If cancer is found, additional imaging tests (CT scan, MRI, or ultrasound) determine whether it has spread to other organs. Blood tests may also be ordered.
Once colon cancer is diagnosed, it is staged from 0 to 4 based on how far it has spread. Stage 0 and 1 cancers are confined to the colon wall. Stage 2 has grown through the wall but not into lymph nodes. Stage 3 involves lymph nodes. Stage 4 means the cancer has spread to distant organs. Staging guides treatment decisions and helps predict outcomes.
Treatment options for women with colon cancer
Treatment depends on the stage, location, and other characteristics of the cancer. Surgery to remove the affected portion of the colon is the primary treatment for most stages. For early-stage cancers, surgery alone may be sufficient. For stage 3 and some stage 2 cancers, chemotherapy is added after surgery to reduce the risk of recurrence. Stage 4 cancers may be treated with chemotherapy, targeted therapy (drugs that attack specific cancer cell features), immunotherapy, or a combination, sometimes alongside surgery.
Women should know that colon cancer treatment does not differ by sex. The same surgical techniques, chemotherapy drugs, and radiation protocols are used. However, women may have specific concerns about fertility, pregnancy after treatment, or sexual function—topics worth discussing with your oncology team before treatment begins, as some options may preserve fertility or address side effects.
When to see a doctor about colon cancer concerns
Contact your doctor if you notice blood in your stool, persistent changes in bowel habits, abdominal pain that does not resolve, unexplained weight loss, or a feeling of incomplete bowel movements. You do not need to wait for screening age if symptoms are present. If you have a family history of colon cancer, ask your doctor at your next visit whether you should begin screening earlier than age 45.
If you are due for screening and have not scheduled it, call your primary care doctor or a gastroenterologist. Many practices now send reminders when screening is due. If cost is a concern, the Colorectal Cancer Screening Program (run by the Centers for Disease Control and Prevention) funds screening for uninsured and underinsured adults ages 50 to 64 in participating states.
Frequently Asked Questions
Can I get colon cancer before age 45?
Yes. While colon cancer is less common in people under 45, rates in younger adults have been rising over the past two decades. If you have symptoms or a strong family history, your doctor may recommend screening before age 45 regardless of age guidelines.
Does pregnancy increase my risk of colon cancer?
No. Pregnancy does not increase colon cancer risk. Some research suggests that pregnancy and breastfeeding may slightly lower risk, though the effect is small and not well understood. Colon cancer during pregnancy is rare but can occur and should be treated.
Will colon cancer treatment affect my ability to have children?
Surgery for colon cancer typically does not affect fertility. Chemotherapy and radiation can affect fertility in both women and men. If you are of childbearing age and concerned about fertility, discuss this with your oncologist before treatment begins. Options like egg freezing may be available.
What is the difference between colon cancer and rectal cancer?
Colon cancer develops in the large intestine (colon), while rectal cancer develops in the last 6 inches of the large intestine (rectum). They are often grouped together as colorectal cancer because they behave similarly and are screened and treated in related ways. Rectal cancer may require different surgical approaches.
If I have no symptoms, do I still need screening?
Yes. Most people with early-stage colon cancer have no symptoms. Screening finds polyps and early cancers before symptoms appear, when treatment is simpler and outcomes are better. This is why screening at age 45 (or earlier if you have risk factors) is recommended even if you feel fine.