Why Your Gut Feels Off Since That Stomach Bug

Hi Friends,

Remember that stomach bug you finally got over? For about 1 in 7 people, it makes an ugly comeback weeks later as bloating, loose stools, or constipation that sticks around.

It is called post-infectious IBS.

Why You Should Read This

⚡ People who had a gut infection had about 4 times higher odds of IBS than those who did not, per a 2024 analysis of 47 studies

⚡ In four of those studies, about 40% of people with post-infectious IBS still had symptoms five years later

What It Is

Post-infectious IBS is IBS that starts after a stomach bug caused by a bacteria, virus, or parasite. The infection clears, but symptoms continue: bloating, diarrhea, constipation, and belly discomfort.

Diarrhea, or a mix of diarrhea and constipation, is the most common pattern. It is a recognized condition, and it can last for months or longer.

Why It Happens

Researchers do not fully understand it yet. Three changes are thought to play a role:

⚡ Microbiome shifts: the illness can change the mix of bacteria in your gut

⚡ Immune activation: low-grade inflammation can linger in the gut lining after the infection clears

⚡ Sensitive gut nerves: nerves may react more strongly to normal things like gas and stretching after a meal

Who Is More Likely to Get It

Bacterial infections carried a higher risk (about 18%) than viral ones (about 11%). Parasites looked higher still (about 30%), but that comes from only two studies, so not too much data.

A more severe or longer illness, female sex, younger age, and high stress around the time of infection have also been linked to higher risk.

What to Do

⚡ Tell your healthcare provider about the infection and roughly when it happened. There are antibodies like anti-vinculin that can be checked if you want a clear answer.

⚡ Ask about other causes if symptoms stick around. A lingering infection, celiac disease, and inflammatory bowel disease can look similar

⚡ Seek care promptly for blood in the stool, weight loss you cannot explain, fever, severe or worsening pain, or symptoms that wake you from sleep

⚡ IBS has treatment options, including diet changes, medications, and gut-brain therapies, chosen based on your symptoms

If your digestion has been off since an infection, you are not imagining it. Talk with your gastroenterologist about what can help.

Talk soon,
Dr. Storage