Colon Cancer In Teens: Symptoms, Causes, Treatment And Risk Factors

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Colon cancer in teens is rare. It is a malignant neoplasm originating in the colon, a part of the large intestine. It is also called colorectal cancer if colon cancer is present with rectal cancer. Although it is common in adults, this can affect any age. A one in 1000,000 incidence rate includes 2.1% of all malignancies in people below 20 (1). Sometimes the diagnosis can be delayed in teens since regular screening is only recommended for adults. Seeking early medical care if there is a family history or for digestive symptoms may help improve outcomes.

Read on to know the causes, symptoms, tests, treatment, and ways to prevent colon cancer in teens.

In This Article

Symptoms Of Colon Cancer In Teens 

Many teens can be asymptomatic during the initial stages of colon cancer. Also, the symptoms may vary based on the size and location of cancer. Symptoms and signs of colon cancer can include (2):

  1. Unexplained weight loss
  2. Tiredness
  3. Persistent abdominal pain, cramps, or gas
  4. Diarrhea or constipation
  5. A feeling of incomplete emptying of the bowel
  6. Blood in stool or dark stool

protip_icon Point to consider
If the location of the tumor in the colon is on the right side, the individual may also feel a lump in the abdomen and might suffer from anemia (15).

The presenting symptoms and signs are similar to the more common conditions found in childhood but, because of its rarity, often leads to a delayed diagnosis and hence presents at an advanced and incurable stage. The onset of irregular bowel movements or changes in bowel habits like constipation, diarrhea, or stool narrowing are common symptoms of colon cancer. Nausea, unexplained appetite loss, unexplained weakness or fatigue, and abdominal mass or lump in the abdomen are some more symptoms likely to be seen by teens in case of colon cancer.

Although blood in stool can be a common symptom of bowel cancer, rectal bleeding may also occur in hemorrhoids (piles), anal fissures (tear in the mucosal lining of the anus), etc. Seek medical care if your teen has changed bowel habits or blood in the feces.

When To See A Doctor

If your teen has any persistent symptoms, then consult a doctor. You may also initiate a medical visit for early screening if you have a family history of inherited syndromes, such as Lynch syndromeiA hereditary genetic mutation that increases the risk for various types of cancer. or colorectal cancers.

Your doctor may help you identify risk factors and arrange a screening. The doctor may refer your teen to cancer experts for detailed diagnosis and treatment if required.

What Are The Causes Of Colon Cancer In Teens?

Most patients did not have a relevant past medical or family history, with the suggestion that these cases arise as a result of spontaneous genetic mutation.

The exact cause of colon cancer is unknown. Genetic changes can be a significant cause in several cases. The mutation (changes) in the cells’ DNA can make them cancerous. It can cause the cell to undergo uncontrolled and unregulated division, thus causing an accumulation of cells that form colorectal tumors (3).

The cancer cells continue to multiply and invade the healthy tissues surrounding it. The cells may also metastasize (move) from the site of origin to other parts of the body via blood or lymph.

Early diagnosis based on suspicion can be influential in determining the outcome.

A population-based study on cancer incidence in adolescents and young adults (AYAs) showed that cancer incidence increased in all AYA age groups during the most recent decade. The graph below also shows that thyroid and lymphoma are the most commonly diagnosed cancers in adolescents. In contrast, the incidence of adolescent colon and rectal cancer and melanoma (skin cancer) cases are comparatively low.

Leading cancer types in teens by age

Source: Cancer statistics for adolescents and young adults, 2020; American Cancer Society

Risks Factors Of Colon Cancer

The following factors may increase the risk for colon cancer (4).

  1. There is an increased risk of colon cancer if a person has a family history of colorectal cancer due to genetic mutations present in families. The risk can be high if more than one family member has the disease. According to the US National Cancer Institute, colorectal cancer is generally rare and is seen in 0.5 cases per 100,000 individuals younger than 20 years in the US annually.
  1. A few cases of colon cancers are linked to inherited syndromes such as Lynch syndrome and familial adenomatous polyposisiCondition where there are a large number of polyps (adenomas) in the large intestine. (FAP), Gardener's syndromeiA subtype of familial adenomatous polyposis characterized by multiple colorectal polyps and tumors. , juvenile polyposisiHereditary condition where benign tumors are found in the gastrointestinal tract. , Turcot's syndromeiHereditary condition characterized by polyps on the inside walls of the colon and rectum, and brain tumors. . These are hereditary nonpolyposis colorectal cancers (HNPCC) that are passed through generations in the family. There is a significant risk for colon cancer if your family has the inheritance of these syndromes
  1. History of polyps or colorectal cancer and the presence of benign adenomatous polypsiGrowths in the mucous membrane that lines the large intestine. in the colon can increase the risk for colon cancer. Colorectal carcinoma may also reoccur in some people
  1. Teens with chronic inflammatory bowel disease, such as ulcerative colitisiA chronic condition leading to inflammation and sores in the large intestine due to an abnormal immune response. or Crohn's diseaseiA chronic inflammatory and autoimmune condition of the digestive system characterized by pain, diarrhea, and fatigue.
  1. Inactive or sedentary lifestyle may be linked to colon cancer. This also increases the risk for obesity and diabetes, which are also risk factors for colon cancer
  1. Low fiber diet with high consumption of calories and fats. Some studies have linked consumption of high amounts of processed food and red meat to colon cancer
  1. Insulin resistance or type II diabetes mellitus 
  1. Obesity   
Obesity increases the risk of colon cancer in teens

Image: Shutterstock

  1. Smoking
  1. Heavy consumption of alcohol 
  1. There is an increased risk of colon cancer among teens who underwent radiation therapy directed at the abdomen for other childhood cancers 

Colorectal cancers are few in young people. The young-onset of bowel cancer can be due to hereditary factors and genetic alterations than other risk factors.

Diagnosing Colon Cancer In Teenagers

The doctor may order a few tests and procedures to confirm or exclude the cancer diagnosis. The tests may include the following (5).

  • Colonoscopy and biopsy: It consists of the visualization of the colon with a device and the collection of samples from suspected areas. These samples are sent to the laboratory for analysis.
  • Blood tests: It is often performed to assess the general health and the functions of the liver and kidneys. A blood test can often be useful to analyze the presence and level of carcinoembryonic antigeniProteins produced by certain types of cancer. (CEA) that is sometimes seen in colon cancer. The level of CEA can help decide treatment and prognosis.

After the confirmation of the colon cancer, your doctor may also order imaging tests such as CT scan, MRI scan, or PET scan to determine the extent (stage) of the colon cancer.

protip_icon Quick fact
Fecal occult blood testing (microscopic detection of blood in the stool) and a barium enema (a series of x-rays of the lower GI tract) may also be used to diagnose colon cancer in children and teenagers (15).

Pelvic, abdominal, and chest imaging is usually done to identify the spread and metastasis before the staging of cancer. However, the doctor may order other tests based on coexisting signs and symptoms, if any.

Stages Of Colon Cancer

The following are the stages of colon cancer (6).

  • Stage 0: Abnormal cells are present in the wall or mucosa of the colon, also called carcinoma in situ.
  • Stage I: Cancer is limited to the mucosal and submucosal lining of the colon.
  • Stage II: Cancer spreads beyond the colon wall without lymph node involvement. This is sub-classed into three stages based on the invasion of nearby tissue and organs.
  • Stage III: Cancer spreads beyond the colon wall and lymph nodes are affected.
  • Stage IV: Presence of metastasis in other organs or tissues of the body.
Stages of colon cancer in teens

Image: Shutterstock

These stages are important to determine the treatment and prognosis of colon cancer. In a few cases, the exact stage of cancer is identified at the time of cancer surgery. 

Colon Cancer Treatment In Teenagers

Colorectal carcinoma treatment is based on the stage and location of cancer, along with the health status of the teen. Treatment for early stages of colon cancer can be minimally invasive surgeries, including the following (7).

  • Polypectomy: This is the removal of colorectal polyps during a colonoscopy. It is done for cancers that are small and contained in a polyp.
  • Endoscopic mucosal resection: It is the removal of cancerous polyps and lining of the colon during colonoscopy with special tools.
  • Laparoscopic surgery: Minimally invasive laparoscopic surgeries are performed to remove colon polyps that cannot be removed during a colonoscopy. These surgeries are performed by inserting special instruments with a camera through a small incision.

Surgeries for more advanced colon cancer may include (7):

  • Partial colectomy (bowel resection): This is the removal of a part of the colon where the cancer is located, along with tissues around it. Colon cancer can be located in any part of the colon, such as sigmoid colon, transverse colon, ascending colon, or descending colon. The affected area is removed and reconnected with the healthy part after the removal of cancer.
  • Hemicolectomy: This is the removal of the left or right segment of the colon in advanced colon cancers. 
  • Colostomy: This is the surgical procedure to create an opening in the abdominal wall where the content (feces) from the colon can be drained into a bag. The colostomy is often done temporarily, and after healing, the colon will be connected to the rectum.
  • Removal of lymph nodes: Nearby lymph nodes are removed to prevent the spread of cancer.

If the colon cancer is in a later stage with metastasis, then surgeons may recommend surgeries to relieve the blockage of colon and other symptoms, such as bleeding or pain. However, if the health status is good, then the removal of metastatic tumors is done with adjuvant chemotherapyiUse of chemo, hormonal, antibody, or radiation therapy in addition to surgery in cancer treatment. to improve survival. 

Other treatments 

Treatments other than surgery for colon cancer include the following.

  • Chemotherapy: It is the treatment of cancer using drugs that can kill cancer cells. Chemotherapy includes drugs like 5-chlorouracil, leucovorin, and cisplatin can be given before surgery to reduce tumor growth, thus making the surgery less complicated. Post-surgical chemotherapy is given to larger cancers with lymph node involvement. It can destroy cancer cells and prevent spread (metastasis) of cancer to other tissues and organs. It may also be done to relieve symptoms (8).
Chemotherapy could treat colon caner in teens

Image: Shutterstock

  • Radiation therapy: This uses energy sources such as X-rays and protons to destroy cancer cells. It can be done before surgery to shrink large cancer or to relieve symptoms if surgery cannot be done (9).
  • Targeted drug therapy: This is treatment using specific drugs to block growth and metastasis of cancer. These drugs can target growth factors, proteins, or genes of cancer cells. It may often be combined with chemotherapy (10).
  • Immunotherapy (biologic therapy): This treatment uses drugs that boost the body’s immune system to fight cancer (11).

Chemotherapy and radiotherapy can be used alone or along with surgery to improve outcomes or relieve symptoms in end stages of colorectal cancer. Supportive care or palliative care is given to relieve pain and other symptoms. This helps improve the quality of life. It can be given alone or with other treatments. 

Complications Of Colon Cancer In Teens

Acute complications of colon cancer can include (12):

  • Bleeding: This may lead to anemia and peripheral circulatory failureiInadequate circulation of blood and oxygen in the body. due to blood loss. Severe rectal bleeding can result in kidney dysfunction and may present with azotemia, which is an increased amount of nitrogen in the blood. Bleeding may also cause persistent fever for days or weeks due to the dysfunction of thermoregulatory functions of the body.
  • Obstruction: Colon cancer can often grow into the lumeniInside of a tubular structure such as the artery or intestine. of the colon and obstruct bowel movement. This may cause decreased absorption of fluid and nutrients and increased secretion of fluids to relieve obstruction, thus eventually resulting in dehydration. Obstruction may also cause dehydration and electrolyte loss due to vomiting and toxemia (blood poisoning) due to increased bacterial growth. Vomiting, distended abdomen, and dehydration can be signs of bowel obstruction. This requires immediate medical care.
  • Perforation: Rarely, colon cancer causes perforation of the bowel wall. This may often occur due to obstruction. Bowel perforation requires emergency surgery.

protip_icon Experts say
In children with a family history of colorectal cancer, the doctor may advise surgery to remove the colon before cancer starts, or they may prescribe drugs to reduce the colon polyps count (15).

If you notice any concerning signs and symptoms in your teen, then make an appointment with the doctor for early diagnosis and treatment. It may help to avoid complications. 

Preventing Teenage Colon Cancer

The best way to prevent colon cancer and its complications is screening at an early age if the risk factors are present. Colon cancer begins as polyps (flat bumps) inside the colon. Regular screening can help to diagnose colorectal polyps and prevent them from turning cancerous.

Screening for colon cancer is usually recommended around 50 years of age. However, early screening is done for high-risk groups such as those who have a positive family history.

The following lifestyle changes may help to reduce the risk factors (4).

  • Maintain a healthy diet: Certain diet modifications, such as including a fiber-rich diet comprised of fruits, grains, vegetables, and other micronutrients, could help prevent colon cancer and other bowel-related issues.
protip_icon Experts say
The American Cancer Society suggests minimizing consumption of red and processed meats while adding more whole grains, fruits, and vegetables to reduce the risk of developing colon cancer (16).
  • Physical activity: Regular exercise can be a protective factor for many diseases, including colon cancer.
Regular exercise in teens can help preventing colon cancer

Image: IStock

  • Avoid smoking and excess alcohol: Teenage smoking and alcoholism could result in many health issues, including colon cancer.

According to the US National Cancer Institute, increasing protective factors and avoiding risk factors may help prevent colorectal carcinoma (4). You may seek medical care for screening and preventive treatments if you have a family history of colon cancers.

What Is The Colon Cancer Survival Rate?

Young-onset bowel cancer has a poor prognosis. It can be due to the advanced stage of disease at the time of diagnosis and the histologic features of the cancer cells. According to the SEER (surveillance, epidemiology, and end results) database, there is a five-year survival rate in 57% of the cases (1).

Diagnosing cancer in your teen can be emotionally challenging for you and other family members. It is the time to make appropriate treatment decisions for your child and support them to cope with the pain and procedure.

Infographic: Parenting Tips For A Child With Cancer

Cancer of any type, such as colon cancer, in teens is rare. Therefore, the diagnosis can be devastating for the parents. Besides medical treatment, cancer requires utmost emotional support for comprehensive healing. Here is an infographic that provides you with some tips on how you may help children who battle cancer.

caring for a child with cancer (infographic)

Illustration: Momjunction Design Team

Frequently Asked Questions

1. Can a 15-year-old have colon cancer?

Yes. Colorectal (or colon) cancer can develop in 15-year-olds, but such cases of pediatric colorectal (or colon) cancer are extremely rare (13).

2. How long can your teen live with untreated colon cancer?

The survival rate of teens and young adults with colon cancer, particularly in stage IV, is relatively low, and if left untreated, it can further lead to a poorer prognosis (14).

3. Are there any long-term effects of colon cancer treatment on teenagers?

The long-term effects of colon cancer treatment on teenagers may vary depending on the treatments used. Long-term consequences may include fertility issues, problems with other organs, increased risk of developing other cancers in life, pain and swelling in other body parts, hormone deficiencies, and the requirement for continued surveillance for recurrence or related conditions (17).

Colon cancer in teens is not very common, though it is treatable when identified in its early stages. However, you may contact counselors, connect with your friends and family or seek support from dedicated organizations to cope with your worries and seek emotional support. Although colon cancer is known to have a poor prognosis rate, there is a fair chance of recovery in individuals in the early stages and by screening high-risk persons with a family history of cancers. Nevertheless, following a healthy diet and lifestyle could diminish the risk of teenage colon cancer.

Key Pointers

  • Colon cancer is rare among teenagers, but early medical attention can help if there is a family history of the disease.
  • Symptoms of colon cancer in teens include rapid weight loss, exhaustion, stomach pain, and blood in their stools.
  • Genetic changes may be a significant contributing factor to the development of colon cancer, although the precise cause is unknown.
  • Diagnosis of colon cancer involves blood tests, imaging, and biopsy.
  • Treatment for colon cancer in teens depends on the stage of cancer, location, and the teen’s health level.

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Stay vigilant to the warning signs of colon cancer, which can have life-threatening implications. Educate yourself on the ten prevalent symptoms for timely detection and intervention.


MomJunction's articles are written after analyzing the research works of expert authors and institutions. Our references consist of resources established by authorities in their respective fields. You can learn more about the authenticity of the information we present in our editorial policy.

1. Colorectal Carcinoma in Children and Adolescents; Children’s National Medical Center
2. Signs and Symptoms of Colorectal Cancer; The American Cancer Society
3. What Causes Colorectal Cancer?; The American Cancer Society
4. Colorectal Cancer Prevention; The National Cancer Institute
5. Magdalena Swiderska, et al., The diagnostics of colorectal cancer; The United States National Library of Medicine (NLM)
6. Colon Cancer Treatment; The National Cancer Institute
7. Ernst J. Kuipers, et al., Colorectal Cancer; The United States National Library Of Medicine (Nlm)
8. Chemotherapy for Colorectal Cancer; The American Cancer Society
9. Radiation Therapy for Colorectal Cancer; The American Cancer Society
10. Targeted Therapy Drugs for Colorectal Cancer; The American Cancer Society
11. Immunotherapy for Colorectal Cancer; The American Cancer Society
12. Xue-Fei Yang and Kai Pan, Diagnosis and management of acute complications in patients with colon cancer: bleeding, obstruction, and perforation; The United States National Library of Medicine (NLM)
13. Seung Yeon Noh et al.; Fifteen-year-old colon cancer patient with a 10-year history of ulcerative colitis; World Journal of Gastroenterology
14. Dai Shida et al.; Shorter survival in adolescent and young adult patients, compared to adult patients, with stage IV colorectal cancer in Japan; BMC Cancer
15. Childhood Colorectal Cancer Treatment (PDQ®)–Patient Version; The National Cancer Institute
16. Can Colorectal Cancer Be Prevented?; The American Cancer Society
17. Late and Long-Term Effects of Cancer Treatment on Adolescents; The American Cancer Society

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Dr. Surabhi Gupta is a consulting Pediatrician in Delhi, with 23 years of experience. She runs an online platform “I care my child,” targeted at children right from newborns to adolescents. Through this platform, Dr. Gupta provides health tips, talks about child growth and development, and covers various topics including healthy eating, addressing various types of infections and how to deal with them.

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Dr Bisny T. Joseph
Dr Bisny T. JosephMedical Doctor
Dr. Bisny T. Joseph is a Georgian Board-certified physician. She has completed her professional graduate degree as a medical doctor from Tbilisi State Medical University, Georgia. She has around 5 years of experience in various sectors of medical affairs as a physician, medical reviewer, medical writer, health coach, and Q&A expert.

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Swati Patwal
Swati PatwalM.Sc. (Food & Nutrition), MBA
Swati Patwal is a clinical nutritionist, a Certified Diabetes Educator (CDE) and a toddler mom with more than a decade of experience in diverse fields of nutrition. She started her career as a CSR project coordinator for a healthy eating and active lifestyle project catering to school children.

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Anindita Ghatak holds a B.Tech degree in Biotechnology from Amity University, Kolkata. During the course of her studies, she has worked on different research projects in the fields of Microbiology and Bioinformatics. Anindita has over three years of experience writing medical articles for journals.

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