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Colon cancer constitutes one of the major causes of cancer global depictions and thus remains a top priority in the fight against cancer. Consequently, the outcomes of colon cancer improve substantially when it is detected early. Among the simplest ways of checking on yourself is watching your bowel habits. It is not true that any change in the stool appearance means cancer, however, some changes are so significant that you must see a doctor without delay.
Among the major functions of the colon are the processing of digested food, the reabsorbing of water, and the forming of stool for getting rid of it. When a cancer starts to grow in this fragile system, it can change the speed, the shape, and the type of stool going through the colon. To put it simply, cancer can block the bowel, cause bleeding, and interfere with the absorption of nutrients and water. Thus, as these alterations worsen, the features of your stool may become quite different.
The way your stool looks can give you a very early indication of how your colon is doing. It is true that early cancer may not give any symptoms at all, but a few changes in stool should raise concern:
Most of the time, bright red blood shows that the bleeding comes from the lower colon or rectum. If the bleeding is from higher up in the gastrointestinal tract, the stools will be black and tar-like.
If your stools become suddenly ribbon-like or extremely thin, it may be tumor narrowing your passageway.
If you have diarrhea or constipation for more than a few days, you definitely need to see a doctor and discuss it with him/her.
There is little mucus in a normal stool, but doctor’s advice is necessary if it is significant or keeps increasing.
Pictures of blood in stool from colon cancer
Tumors of early stages are little and limited in size. Most people won’t see any obvious changes of their stool, but there might be blood on a microscopic level.
The growth of cancer may have penetrated the colon the deeper layers of the wall. Changes that are likely to happen include:
At this stage, cancer has spread to the lymph nodes close to the primary tumor. Symptoms can be:
When the disease is very far progressed, bowel function is disrupted completely:
Alarming stool changes causing worries about cancer are not always the case. Other major causes of such symptoms are:
Medical interventions are required when you have:
It is highly recommended to have regular screening starting from the age of 45 or even earlier if you have a family history of this disease. Although a colonoscopy is the most reliable and accurate method, there are also less invasive, home-based stool tests that can be done.
The tests are aimed at detecting substances that are not visible to the naked eye in the stool or genes that may indicate colon cancer. They do not give information about cancer stage, and any positive results must be confirmed by colonoscopy.
It is a yearly recommendation. There are two main types of FOBTs:
This test adopts antibodies to locate blood. You can eat as you like. It does a great job in lowering the death rate from the disease.
It depends on a chemical reaction for blood detection. It is less sensitive and requires that the patient prepares his/her diet.
Besides blood, this test looks for DNA mutations that may indicate cancer. It is much more sensitive than FIT but also with higher false-positive rates. The test is recommended once every 1–3 years for individuals aged 45 and above.
This is a new test that identifies RNA markers together with blood and takes into consideration factors such as smoking status. For cancer and advanced polyps, this test is more sensitive than FIT. The recommendation is every 3 years for adults aged 45+.
If the colonoscopy is normal following a positive test for mt-sDNA or mt-sRNA, you can go back to the regular 10-year screening intervals.
Screening for colon cancer should be performed on every adult starting at age 45. People with a family history or other risk factors should get tested even earlier. A colonoscopy is still the most accurate and commonly preferred method. Normally, it is done every 10 years if the findings are negative. Noninvasive tests can also be performed at home; thus, yearly FIT, annual gFOBT, or multitarget stool DNA or RNA tests every 1–3 years are some of the options available. A colonoscopy has to be performed to confirm a positive result obtained from a stool-based test. After a colonoscopy with a negative result following a positive stool test, it is safe to go back to the regular 10-year screening interval.
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