As your symptoms have persisted for about 6 years, your problem is very unlikely to be due to colon cancer. If the symptoms were due to cancer, your symptoms should have changed within a few years. In your case, you should speak to your family physician about the symptoms and he/she may recommend treatment for your symptoms first.
When a person is worried about colon cancer, the most appropriate and accurate diagnostic test is colonoscopy. Stool occult blood test is only used for screening of healthy individuals without symptoms. Radiologic tests require exposure to low dose radiation and if any abnormalities are suspected, you will still have to undergo colonoscopy.
Based on the latest statistics from Singapore Cancer Registry published in 2017, there are about 1,900 new colon cancer patients each year. Among these patients, about 10 (0.5%) are diagnosed below the age of 35. Therefore, your risk of colon cancer at this time is very low but it is not zero. Speak to your family physician first and he/she will advise you.
