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A rule of thumb is to seek medical care whenever rectal bleeding occurs, regardless of whether there’s an obvious haemorrhoid or not.
Once the patient has been seen by a doctor they may be referred for a colonoscopy; a procedure involving a long flexible instrument.
The thin tube has a camera on the end and is passed through the anus and through the rectum and colon.
If it detects any polyps along the way, these will be received during the procedure and sent off to a laboratory for further examination.
Picked up early, the disease has a survival rate of up to 91 percent, but once it has spread to surrounding tissues or organs the survival rate drops to 72 percent.
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