- Haemorrhoids are clusters of vascular tissue, smooth muscle and connective tissue arranged in three columns along the anal canal. In healthy individuals, they act as cushions that help maintain continence.
Sandler RS, Peery AF. Rethinking What We Know About Hemorrhoids. Clinical Gastroenterology and Hepatology. 2019;17:8–15. doi:10.1016/j.cgh.2018.03.020
- Although haemorrhoids — or ‘piles’ as they are otherwise commonly known — are normal structures, the term has become synonymous with them in an abnormally swollen and symptomatic state
NICE Clinical Knowledge Summary. Haemorrhoids. National Institute
for Health and Care Excellence. 2016.
https://cks.nice.org.uk/topics/haemorrhoids
(accessed Jan 2022).
- It occurs when one strains in the toilet. This commonly occurs during constipation or during prolonged diarrhoea.
- When one strains it puts pressure on the abdomen causing blood vessels (varicose veins) in the back passage to swell and inflame which in turn causes pain and bleeding.
- Some can cause a blood clot in the blood vessel (thrombosed haemorrhoid)
Thrombosed haemorrhoids (acute haemorrhoidal disease, or perianal thrombosis)
- Haemorrhoids that have no blood flow due to blood clots.
- They’re most often external but can be internal, as well.
- They are not considered to be dangerous, yet they can be quite painful.
- They may present as a single lump or a circle of lumps.
- In most cases, the blood clot is eventually reabsorbed by the body and the symptoms resolve themselves (the pain peaks at 48-72 hours after first signs and begins to decline by the fourth day as the thrombus is reabsorbed).
verywell health
Causes
- Pregnancy
- Long term cough
- Heavy lifting
- Constipation (straining when going to the toilet)
- Diarrhoea
- Low fibre diet
- Overweight
- Certain toilet behaviours, such as straining or spending more time on a seated toilet than on a squat toilet.