Is IBD contagious, and can I pass it to my family or partner?
No. IBD is not an infection and cannot be caught or passed on through contact, food, or sex. It does run in families through genes, so a close relative has a somewhat higher chance of developing it, but that is inherited risk, not transmission, and most relatives never develop IBD.
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This worry is common, and the answer is clear: IBD is not contagious. You cannot catch Crohn's disease or ulcerative colitis from another person, and you cannot give it to anyone else (Crohn's & Colitis Foundation).
Why it cannot be caught
IBD is not an infection. It is an immune-mediated condition, where a person's own immune system attacks their gut and causes inflammation (Cleveland Clinic). Because there is no germ to pass on, it cannot spread through everyday contact, sharing food or cutlery, kissing, or sex (Crohn's & Colitis Foundation). Your partner cannot catch it from you.
What about family?
This is where the difference between contagious and inherited matters. IBD is not transmitted, but a tendency to develop it can run in families through genes. Between 5 and 20 percent of people with IBD have a parent, child, or sibling who also has it (Crohn's & Colitis Foundation).
That means a close relative has a somewhat higher chance of developing IBD than the general population, but it is a raised risk, not something being passed across like an infection, and most relatives never develop it. Whether IBD is passed to children specifically is covered in its own question in the family and pregnancy section.