Haemorrhoids are small, blood-filled swellings, caused by dilated (varicose) veins of the rectum or anus, that cause anal bleeding, itching and discomfort. They may be located at the beginning of the anal canal (internal haemorrhoids) or at the anal opening (external haemorrhoids) and may be present for years, but go undetected until bleeding occurs. Haemorrhoids are not dangerous
Constipation and straining during bowel movements may cause haemorrhoids by increasing the pressure in the anal or rectal veins. Other factors that may contribute to haemorrhoids include a low fibre diet, prolonged sitting or standing, obesity, anal intercourse, pregnancy and loss of muscle tone due to old age or rectal surgery.
In many cases haemorrhoids can be controlled by simple measures:
More troublesome haemorrhoids may require additional treatment.
Fiber shows a consistent beneficial effect in relieving hemorrhoid symptoms and bleeding. It can soften stool and increase its bulk, which helps to reduce straining. Seven randomized trials with a total of 378 participants have found fiber improved symptoms including itching, discomfort, and pain.
Bioflavonoids are a type of plant compound that are thought to work by stabilizing and strengthening blood vessel walls and by decreasing inflammation. They have been found to reduce anal discomfort, pain, and anal discharge during an acute hemorrhoid attack. Side effects of bioflavonoids appear to be mild and rare, making them a promising treatment for hemorrhoids in pregnancy (the flavonoid tangeretin however, shouldn't be used by people taking tamoxifen for breast cancer).