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Researchers have found variations in dozens of genes which may be linked to developing ulcerative colitis, but the role of these variants is not yet confirmed or fully understood. 
Heritability means how much of the differences in a trait (like height) within a group of people can be attributed to differences in genetics.
Something like eye colour has very high heritability (>80%), which means it’s almost completely determined by genetics. Something like a person’s first language has 0% heritability - as that’s entirely to do with their environment.
What it doesn’t mean is how likely something is to be inherited from a parent , as even if a condition had 100% heritability, and so was completely down to genetics, it might be associated with a dominant or recessive gene, or more likely associated with many many genes, which interact in complex ways and which are still being explored & discovered!
Severity of symptoms varies, depending on how much of the colon is inflamed and how severe the inflammation is. 
6.8 million cases of IBD were recorded word-wide in 2017 with its global prevalence growing significantly over a 27 year period. 
The Nation Institute for Health and Care Excellence (UK) reports that ulcerative colitis can develop at any age, but that peak incidence occurs between the ages of 15 and 25 years. 
These are the best resources we've found so far on managing and learning about Ulcerative colitis. Please let us know if you have other and we'll add them to the list!
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