Scientists do not as yet fully understand what causes Ulcerative Colitis, but there are several different risk factors from which we can build up a picture of possible causes.
Family History – Apparently up to 20% of people with Ulcerative Colitis will have a family member who also has the disease. This could be due to genetic factors, where by there is an ulcerative colitis gene which is activated in some family members, or perhaps caused by environmental factors, such as bad diet and lifestyle within a family which leads to ulcerative colitis manifesting. There is also much higher likely hood of developing UC if you are of Northern European Descent. Colitis is also especially prevalent amongst Ashkenazi Jews
Geography – Incidence of Colitis is greatest the further you get away from the equator, which suggests a link between sunlight exposure and colitis, Sunlight produces Vitamin D which a lack of has been linked to Autoimmune conditions like Ulcerative Colitis. It is also much more prevalent in Europe and North America than in other parts of the world, which would fit with a link to sunlight exposure, as in these developed countries we tend to spend more time indoors, as well as there being not much sunshine in winter in many places in these countries.
Autoimmunity – Ulcerative Colitis is commonly thought to be an autoimmune condition, where the body’s immune system is reacting against itself. In the case of Colitis the immune system reacts in the wrong way to bacteria in the digestive tract, and that immune response leads to inflammation of the colon and ulceration. Autoimmunity has been suggested to be triggered by a ‘leaky gut’ whereby food proteins cross the gut barrier intact causing the immune system to attack them. If this is proven to be the case a leaky gut could turn out to be the root cause of colitis, and may well be curable.
Environmental Factors – Ulcerative Colitis is statistically a disease of non smokers. It is more common in non-smokers and ex-smokers, in fact nicotine patches have been tested with some success as a treatment for Colitis. Working & Living environment has also been suggested to play a role in development of Ulcerative Colitis – people living in cities and those who work in office environments seem to have a greater incidence of the disease than people who live in the country and or work outside. This is another indication that lack of sunlight exposure may play a role. Dirt may also play a role and there are suggestions that Colitis could be caused by living in to clean an environment so the immune system doesn’t have enough to do, so practices on itself, this is suggested by the apparent success of Helminthe worm therapy, whereby parasitic worms have been used to bring about remission in UC and other autoimmune conditions.
Bacterial Infection or Virus – It is possible that a viral or bacterial infection could be responsible for triggering an immune response, which continues after the infection has passed, possibly due to a genetic predisposition whereby the gene is triggered by the infection but fails to switch off after it has passed. Or perhaps a particularly stubborn pathogen that is never quite destroyed by the immune system.
Bad Diet – It is quite possible that a diet excessively high in sugar, alcohol and grain based carbohydrates, can lead to a disbiosis of intestinal bacteria, meaning an imbalance between good friendly bacteria and bad disease causing bacteria. This may initially show itself as foul smelling wind and general bloating and discomfort, ultimately leading to Colitis if things get really out of control. A bad diet high in sugars & carbs – typical in most western countries – is also likely to set the stage for a leaky gut which is another possible cause of colitis.
Conculsion -
Whilst there is still no clear proven cause of Ulcerative Colitis, we can take an educated guess from the information avaliable.
Personally I think that my Colitis was caused by several factors. For several years before my first flare up I used to eat a lot of junk food and sweets as well as being a big beer drinker, I think this set the stage for colitis to develop, as during this time I did suffer from some rectal bleeding – only small which my doctor told me was from piles, I was also often constipated and had foul flatulence !
Then I went on Holiday and had food poisoning which I recovered from – but a month after that my Ulcerative Colitis developed and I ended up in hospital with a massive first flare up.
Now I have colitis, if find that many things affect it but – most notably – diet, and the amount of sunshine I get. Interestingly nobody else in my family has colitis in any way so there does not appear to be a genetic link in my case.