We all have haemorrhoidal vessels, but we don’t all have haemorrhoids. Some 50% of people over the age of 50 years have some degree of symptomatic haemorrhoids.
There are external haemorrhoidal vessels covered by skin which can become external haemorrhoids. There are internal haemorrhoidal vessels covered by the lining of the rectum, known as mucosa, which as its name suggests secretes mucous, and is easily traumatised by stretching and can bleed.
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