Health encyclopaedia

Health encyclopaedia - Alphabetical Topic List

Haemorrhoids

Haemorrhoids, also known as piles are rather like varicose veins in the canal of the anus. Here, just under the mucous membrane inner lining, is a considerable network of veins extending upwards for an inch or so from the level of the skin to just above the anal canal, where it joins the rectum. When the veins of this network become swollen with blood, haemorrhoids occur.

The vein swelling can affect the part of the network just above the anal canal, where it is less well supported by the muscular ring (sphincter), and this causes internal haemorrhoids. Or it may affect the veins at the lower end of the canal, just under the skin, causing external haemorrhoids. Some people have both.

Haemorrhoids are a common problem and affect around 50% of people at some time in their life.  Although uncomfortable and embarrassing, it is not normally a serious condition.

• Symptoms
• Causes
• Diagnosis
• Prevention
• Treatment

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