Top 10 Signs of Colon Cancer

There is a reason colon cancer is sometimes called “the silent killer.” Not only is it the third most common type of cancer (skin cancers excepting) in the United States today, but given the variance in the symptoms of colon cancer, it can readily masquerade as something other than what it truly is.

Despite ongoing research, scientists still have not confirmed the exact causes of colon cancer. For this reason, prompt diagnosis of colon cancer begins with the knowledge required to recognize early warning signs before the cancer has time to progress. Once an accurate diagnosis has been confirmed, treatments for colon cancer can begin. When it comes to this deadly cancer, which affects an estimated 1 in every 20 Americans, time is of the essence in identifying warning signs, obtaining a firm diagnosis and beginning a course of treatment.

10. Trouble with bowels

Diarrhea, constipation, Irritable Bowel Syndrome (IBS), narrow stool, constipation, change in consistency of the stool and other bowel-related issues can all act as early messengers of the onset of colon cancer.

Often, individuals later diagnosed with colon cancer will look back and see prior diagnoses that included IBS, colitis, constipation or other issues associated with abnormalities in the bowel.

Andrey Bondarets / Shutterstock.com
Andrey Bondarets / Shutterstock.com

9. Feeling fatigued or weak

Colon cancer is predominantly marked by the appearance of polyps, or tumors, along the colon. Cancerous tumors can cause bleeding into the intestinal area, which can in turn cause anemia.

Loss of blood is often marked by feelings of dizziness, weakness, fatigue, exhaustion and respiratory difficulties. When accompanied by persistent feelings of coldness (even when it is warm outside), pale skin, sleeping more than usual and loss of interest in staying physically active, these can all be signs of the onset of colon cancer.

Creativa Images / Shutterstock.com
Creativa Images / Shutterstock.com

8. Unexplained weight loss

In a culture that often seems literally obsessed with losing weight, when it comes to colon cancer, weight loss is not something to strive for. When there’s a loss of weight or a loss of appetite (or both) that doesn’t seem to be linked to anything definitive, it may be linked to colon cancer.

This is because colon cancer reduces the body’s efficiency at filtering out and eliminating wastes. The backup of waste matter in the body causes a biological slowdown to the appetite. Individuals later diagnosed with colon cancer often report feelings of “fullness” (not unlike what a woman in the later stages of pregnancy might experience), saying they just aren’t hungry for some reason.

Monkey Business Images / Shutterstock.com
Monkey Business Images / Shutterstock.com

7. Stomach distress

Everyone has trouble with gas and bloating sometimes. But when issues with gas, bloating, cramping, discomfort, pain, nausea or indigestion seem to become common or even chronic, this is a sign that requires additional immediate attention.

One analogy made by individuals suffering colon cancer-related stomach distress is that it felt a lot like having an ulcer. This is especially significant, since it is easy to misdiagnose colon cancer at this stage as heartburn and take antacids to try to resolve it. But as cancerous polyps grow and become tumors along the digestive tract, these growths can become obstructions that produce acid as undigested food accumulates. For this reason, if heartburn-like symptoms persist, it is time to get a second opinion.

Alice Day / Shutterstock.com
Alice Day / Shutterstock.com

6. Pain in the abdomen

Feelings of pain in the abdominal area can arise for all kinds of reasons — even more so for women who are still in their childbearing years and experiencing regular menstrual cycles. One of the main ways to tell the difference is if the pain doesn’t seem to go away on its own.

This pain may be caused by a tear in the intestinal tract or by an obstruction due to a cancerous polyp. It may also be caused by a nearby organ that is affected by the cancer growth. Here again, if the pain persists, it is important to rule out other possible causes (parasites, PMS, et al) to get to the root of the issue.

g-stockstudio / Shutterstock.com
g-stockstudio / Shutterstock.com

5. Blood in stool

At some point in life, most people experience blood in the stool for a very common reason: hemorrhoids. But where hemorrhoids result from a bit too much pressure on the sensitive blood vessels near the anal area, the blood from colon cancer comes from a much different source.

If the blood in the stool is bright red, this generally indicates that it is coming from right near the end of the rectal area (it hasn’t had time to get discolored by passage through the intestinal tract). If the stool begins to look much darker, or if the blood begins to look like a darker red color or even black, this can be an indication of bleeding somewhere farther up inside the bowel, colon or digestive tract.

Whether the cause is a stomach ulcer or some other type of cancer or colon cancer, it is critical to pursue testing until an accurate diagnosis is confirmed.

VGstockstudio / Shutterstock.com
VGstockstudio / Shutterstock.com

4. Vomiting

Vomiting is something most people experience at some point for a variety of reasons. Vomiting can be a sign of colon cancer when a blockage in the colon leads to the backup of solids, liquids, waste matter, trapped gas and bile, which can cause nausea that leads to vomiting.

michaelheim / Shutterstock.com
michaelheim / Shutterstock.com

3. Jaundiced skin

Because the body’s blood supply circulates from the bowel to the liver, the organ that colon cancer most commonly spreads to first is the liver. As the cancer metastasizes (spreads) into the liver, it can block the bile ducts, causing the bile to re-enter the bloodstream. The bile is what turns the skin and often the whites of the eyes yellowish in color. The bile may also appear in the urine, turning it a darker yellow color.

If the skin itches, the stools are becoming paler in color, the urine is darker and the skin is tinged with yellow, these are all signs of jaundice that could be arising from a liver infected with colon cancer.

komkrit Preechachanwate / Shutterstock.com
komkrit Preechachanwate / Shutterstock.com

2. Constant feeling of bowel urgency

It can be very unpleasant to feel a near-constant need to have a bowel movement. That constant sense of pressure, of urgency, can begin to interfere with daily life activities and quality of life.

Whether there is pressure right after a successful bowel movement or pressure that never results in a bowel movement or something in between, it is vital to determine what is causing the feelings of urgency. There could be a tumor placing pressure on the rectal tissues or even a blockage that traps some stool inside the body. In any scenario, bowel urgency is a matter that must be diagnosed immediately.

Miriam Doerr / Shutterstock.com
Miriam Doerr / Shutterstock.com

1. Unexplained iron-deficiency anemia

For colon cancer that develops first on the right side of the colon, iron deficiency that leads to anemia is often an early warning sign, more so than any detectable tumor growth or bowel obstruction.

What makes anemia such an important warning sign is that colon cancer that begins in the right side of the colon is often much harder to detect. The slow blood loss caused by cancerous tumors growing inside the right portion of the colon is what can lead to iron-deficient anemia over time.

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ktsdesign / Shutterstock.com