Colon cancer develops in the large intestine, which includes the colon and rectum. It often develops quietly in the early stages, where symptoms are vague and sometimes mistaken for common digestive issues such as constipation, indigestion, or haemorrhoids.
If you have persistent changes in your bowel habits, unexplained fatigue, or blood in your stool, it is worth getting checked early.
Early symptoms are often subtle and may come and go. You might not think much of them at first, especially if they seem mild.
Subtle Bowel Habit Changes
If your bowel habits change, leading to constipation, diarrhoea, or both, and this continues for weeks, it is worth paying attention to. Even changes in stool shape or frequency can be relevant.
Intermittent Abdominal Discomfort
If you notice recurring bloating, cramps, or a dull discomfort in your lower abdomen, especially without a clear cause, it should not be ignored. These symptoms may resemble common stomach issues but tend to persist or recur.
Fatigue From Iron-Deficiency Anaemia
If you feel unusually tired even after rest, or you get breathless more easily than usual, it may be due to low iron levels caused by slow internal blood loss. This is something that often develops gradually.
Occasional Blood In Stool
If you notice blood when passing motion, even if it happens only once in a while, it should be checked. It could be piles, but you may want to be safe and rule out the possibility of cancer.
Advanced Colon Cancer Symptoms
Those with colon cancer in Singapore usually notice symptoms becoming more obvious and harder to ignore as the condition progresses.
Persistent Bleeding
If blood in the stool becomes frequent or more obvious, it is an important warning sign that needs medical attention.
Bowel Obstruction Symptoms
If you feel like your bowel is not emptying properly, or you experience ongoing constipation, thin stools, or abdominal swelling, it may indicate a blockage caused by a growth in the bowel.
Unexplained Weight Loss
If you are losing weight without changes in diet, exercise, or lifestyle, it is a symptom that should not be overlooked, especially if it occurs alongside bowel changes.
Ongoing Abdominal Pain
If abdominal discomfort becomes more constant or starts interfering with daily activities, it may suggest progression of an underlying condition.
How Colon Cancer Symptoms Progress Over Time
Colon cancer is often described as a “silent” condition because it does not follow a linear path of sudden illness. Instead, symptoms evolve alongside the physical growth of a tumour within the colon.
The Early Shift: Subtle and Intermittent
In the beginning, symptoms are rarely constant. You might experience a “bad week” of digestion or unusual fatigue that seems to resolve itself with rest or diet changes. Because the tumour is small at this stage, it may only cause minor irritations to the bowel lining or microscopic blood loss that isn’t visible to the naked eye.
This is the stage where many people mistakenly credit their symptoms to work stress or a change in diet.
The Transition: Increasing Frequency
As a growth increases in size, it begins to physically obstruct the passage of waste. What was once “occasional” constipation may become your new baseline. Bleeding may transition from a one-off occurrence to something you notice several times a week.
At this point, the body’s compensatory mechanisms, like trying to push waste past a narrowing in the colon, start to cause the more noticeable cramps and bloating mentioned above.
The Advanced Stage: Systemic Impact
In later stages, the symptoms move beyond the localised area of the colon and begin to affect your overall systemic health.
- Physical Obstruction: The tumour may narrow the bowel significantly, leading to “pencil-thin” stools or a constant feeling of fullness.
- Nutrient & Energy Depletion: The cancer begins to consume more of the body’s energy and resources, and chronic blood loss leads to more profound anaemia. This results in the unexplained weight loss and “bone-deep” exhaustion that characterise advanced progression.
Understanding Colon Cancer Staging And Symptoms Relation
Here’s a breakdown of colon cancer staging, which helps to show how far the condition has spread. Symptoms usually become more noticeable as the disease progresses.
Stage 0
Abnormal cells are limited to the inner lining of the bowel. Symptoms are usually not present.
Stage 1
Cancer begins to grow into the bowel wall. Symptoms may still be mild or absent.
Stage 2
The tumour grows deeper into the bowel wall. You may start noticing bowel changes or abdominal discomfort.
Stage 3
Cancer spreads to nearby lymph nodes. Symptoms such as bleeding, fatigue, and bowel changes become more noticeable.
Stage 4
Cancer spreads to other organs. Symptoms become more widespread and may include weight loss, severe fatigue, and persistent abdominal issues.
Recurrent
Recurrent colorectal cancer means it has come back after disappearing for at least one year. In more advanced colorectal cancers, it may return in just a few months. This may mean that the first round of chemotherapy has not been able to remove all of the cancer cells.
Risk Factors Of Colon Cancer
Risk factors refer to anything that increases your chance of getting a disease, like cancer. Some risk factors are hereditary, while others, such as smoking, can be changed.
Having a risk factor, however, does not necessarily mean you will have the disease. Additionally, some people who get colon cancer may not have any known risks.
Risk factors of colon cancer may include:
- Age – People 50 and above tend to be at a higher risk of developing cancer. The majority of colorectal cancer cases are diagnosed in individuals of that age.
- Weight – Overweight or obese individuals are at a higher risk of developing and dying from colorectal cancer. The risk is the same in men and women, but it seems to be far stronger in men. Following a healthy lifestyle and maintaining a good diet may help lower the risk.
- Medical history of polyps – Individuals with colorectal polyps are also at high risk. The polyps may potentially develop into colorectal cancer.
- Medical history of cancer – Individuals who have had colorectal cancer before and women who have had ovarian, endometrial, or breast cancer may also face a higher risk.
- Inflammatory bowel disease – Chronic inflammatory intestinal diseases like ulcerative colitis or Crohn’s disease (colon inflammation) may also increase the risk of developing colorectal cancer.
- Smoking and alcohol intake – This is also a high-risk factor for cancers and colorectal cancer.
Early detection of colon cancer symptoms may also involve monitoring the growth of colon polyps.
How To Reduce The Risk Of Developing Colon Cancer
The most effective way to reduce your risk of colorectal disease is to undergo screening, starting at age 45. Regular screening significantly increases the chances of early detection and successful treatment outcomes, as opposed to seeking medical attention only after colon cancer symptoms develop.
Below are also other healthy habits to follow:
- Exercise regularly
- Reduce consumption of vices like smoking and alcohol
- Eat fruits, vegetables, and whole-grain foods
- Consume less red meat and processed meats
Early detection, which hinges on recognising the symptoms of colon cancer in Singapore, can greatly improve treatment outcomes. Increased awareness of the symptoms of colon cancer in Singapore has led to earlier diagnoses and better prognosis for many.
When To See A Colorectal Specialist In Singapore
If symptoms are not improving or keep coming back, it is time to get them assessed.
If you notice more than one symptom at the same time, such as bowel changes with fatigue or bleeding, it becomes even more important not to wait.
A colorectal specialist in Singapore can help assess what is going on, rule out serious conditions, and guide you on whether further tests like a colonoscopy are needed.
Early review often leads to earlier answers, which makes management much more straightforward.
How Do Doctors Diagnose Colon Cancer
Detecting cancer cells and precancerous polyps can be done through screening tests. These are recommended for people aged 50 and above.
Once symptoms appear, doctors will recommend diagnostic tests to confirm if it is colon cancer, determine its staging and identify the most effective treatment.
These include clinical tests for colorectal cancer diagnosis, such as colonoscopy and imaging studies.
The following tests are often used to diagnose colorectal cancer:
Sigmoidoscopy
A sigmoidoscope is a small tube inserted into the anus, passing through the rectum and into the sigmoid colon. Sigmoidoscopy helps detect polyps or colon cancer. A colonoscopy may be recommended if either is detected.
Colonoscopy
Like sigmoidoscopy, colonoscopy involves a tube with a tiny camera attached to the end. This allows the doctor to examine the entire length of the colon and rectum. A doctor can remove polyps or get tissue samples for further tests through a colonoscopy.
Faecal Occult Blood Test
A faecal occult blood test or FOBT is a lab test to examine stool samples. It checks for blood in the faeces or stool, but a positive result may not necessarily be sufficient to confirm a colorectal cancer diagnosis.
CT Colonography
Also known as virtual colonoscopy, CT colonography involves x-ray equipment to examine the large intestine for cancer and colon polyps.
Barium Enema
A barium enema is another x-ray exam that detects abnormalities in the large intestine or colon. It’s also referred to as a colon x-ray.
An enema is the injection of liquid into the rectum through a small tube. The liquid contains barium, a metallic substance coating the colon lining. This allows for more detailed imaging of the inner lining of the colon.
Treatment For Colon Cancer in Singapore
40% of colon cancer cases occur at an advanced stage, wherein surgery is the best option. Laparoscopic or keyhole surgery can be performed in such cases of early to mid-stage cancers.
In such cases, colorectal cancer treatment approaches in Singapore are tailored based on staging and patient condition.
Open surgery is needed to completely remove the tumour and affected lymph nodes for the more advanced colorectal cancer. Open surgery may be done for emergencies, like a tumour obstruction.
Chemotherapy
Chemotherapy involves using specific drugs to help destroy cancer cells, especially if they have spread to the lymph nodes. This treatment may also be recommended pre-surgery to shrink the tumour.
Targeted Therapy
Targeted therapy targets specific cancer cell abnormalities. It is usually done for the more advanced colon cancer.
Radiation Therapy
Using high-energy X-rays and protons, radiation therapy helps destroy cancer cells or shrink tumours before surgery. This treatment may be used alongside chemotherapy.
Can Colon Cancer Be Present Without Symptoms in Singapore?
Yes, it can. In the early stages, there may be no symptoms at all. This is known as being asymptomatic, meaning the condition is present but not causing any noticeable signs or discomfort.
Because of this, you might feel completely well even though changes are already happening in the bowel. This is also why screening is sometimes recommended, especially if you are in a higher-risk group or fall within routine screening age ranges.
By the time symptoms start to appear, the condition may already have progressed. This is why early detection plays an important role, even before any symptoms are felt.
Seek Professional Guidance for Colon Cancer Symptoms in Singapore
If you are noticing changes in your bowel habits, persistent abdominal discomfort, or any blood in your stool, it is important not to ignore them. These symptoms do not always mean colon cancer, but they do need proper assessment.
An effective way to reduce risk and detect issues early is through a screening test. This helps identify any abnormalities in the bowel, including polyps, before they develop into more serious conditions.
If you are concerned about colon cancer or want clearer advice on what your symptoms mean, you can seek a consultation with Dr QM Leong, an experienced colorectal surgeon in Singapore.
Frequently Asked Questions
About Symptoms Of Colon Cancer In Singapore
How early do colon cancer symptoms typically appear?
Symptoms often do not manifest until the cancer has grown or spread, so regular screening is crucial for early detection. When colon cancer symptoms do appear, it can indicate that the cancer is in a more advanced stage.
How long did it take from noticing symptoms to receiving a colon cancer diagnosis?
Some individuals might seek medical attention promptly and receive a diagnosis within weeks, while others may delay seeking help, leading to a more extended period before diagnosis. On average, it can take several weeks to months from the initial appearance of symptoms to a confirmed colon cancer diagnosis, depending on the individual’s responsiveness to symptoms and access to medical care.
How did individuals first realise their symptoms could be serious?
Individuals with colon cancer often realise their symptoms could be serious when they experience persistent changes in their bowel habits, notice blood in their stool, or feel unexplained and prolonged abdominal discomfort. Significant weight loss without a clear cause and persistent fatigue can also prompt individuals to seek medical advice.
What are the misconceptions about colon cancer symptoms that Singaporeans might have?
Common misconceptions about colon cancer symptoms among Singaporeans might include the belief that only older individuals or those with a family history are at risk. Others might assume that symptoms are due to less serious conditions like haemorrhoids or irritable bowel syndrome. There is also a tendency to ignore or downplay symptoms due to embarrassment or lack of awareness about the seriousness of the condition.
What role do diet and lifestyle play in the manifestation of colon cancer symptoms?
Diet and lifestyle are significant in the risk and manifestation of colon cancer symptoms. A diet high in red and processed meats and low in fruits, vegetables, and whole grains can increase the risk. Additionally, a sedentary lifestyle, obesity, smoking, and heavy alcohol use are risk factors. Conversely, a balanced diet rich in fibre, regular exercise, keeping a healthy weight, and avoiding tobacco and excessive alcohol can reduce the risk and contribute to overall colon health.
