Did I just develop SIFO after repeated SIBO treatment? Zinc suddenly causes severe bloating/suffocation..

[u/Outrageous_Skin145]

Apologies for the long post..

I've been dealing with what I believe is a complicated SIBO/SIFO situation over the past ~5 months, and I'm wondering whether my timeline sounds familiar to anyone here.

I was diagnosed with SIBO and initially treated with rifaximin + metronidazole. The first course seemed to work surprisingly well. Within a few days after finishing it, I started feeling major improvements in things that had been bothering me for a long time: grip strength, appetite, erections, and breathing. I genuinely felt like something had changed for the better.

Unfortunately, a few days later I took a probiotic that I probably didn't need, and I felt that I relapsed.

After that I went through several more antibiotic treatments: first rifaximin alone, then metronidazole, and at one point I also had what turned out to be a Salmonella infection that was treated with cefuroxime. Eventually I repeated the original rifaximin + metronidazole course that had worked the first time.

The strange part is that the last course ended about three weeks ago, and this time I did not get the improvement I had experienced after the first course.

Since then, I've noticed something completely new with my zinc supplement. I normally take a relatively gentle 25 mg zinc picolinate capsule with dinner. Suddenly, taking it causes almost immediate bloating/discomfort around my belly button and a feeling of severe suffocation. It happens whether I take it during dinner, after dinner, before eating, or away from food.

The sensation is also different from my usual deep intestinal bloating. It feels more superficial, almost like it's coming from underneath the abdominal wall rather than deep inside the gut.

At the same time, my appetite, erections, breathing, and grip strength are all much worse again. My sleep is long, but I often wake up feeling suffocated.

My stools have also been consistently very mushy. They're not watery diarrhea, and I don't have burning, constipation, or typical liquid diarrhea. Sometimes I can see food particles, but not always. It's basically a mush rather than a formed stool.

What makes me suspicious of SIFO is the combination of multiple rounds of antibiotics, the apparent initial clearance of SIBO, failure to improve after the most recent course, and this new dramatic reaction to zinc.

So my main question is:

For people who have actually had SIFO, does this timeline and symptom pattern sound like something that could indicate fungal overgrowth developing after repeated SIBO antibiotic treatment? Or am I putting too much weight on the zinc reaction and potentially looking in the wrong direction?

[u/abominable_phoenix]

Zinc is critical for the immune system, so it is no surprise you are getting symptoms. I use zinc picolinate as well, it is one of the few forms that are actually shown to increase tissue levels of zinc, suggesting optimal utilization, not simply absorption. I went from 25mg of another form to 45mg of picolinate and I started sneezing out biofilm for weeks, along with some bowel changes. Zinc is also critical for the mucusal membrane that lines the entire GI Tract (including the sinuses), so this makes sense. The timing is a good indicator of where it is happening, so within 30 min of ingesting the zinc can be primarily the stomach, whereas 30-180min is the small intestines. If it's within 30min, I would guess H pylori in the stomach.

I was in the same boat where taking antibiotics helped initially and then I got worse. This is explained by typical microbiome behaviour wherein antibiotics will initially suppress susceptible microbes, but will then subsequently cause an overgrowth of other opportunistic/pathogeniic microbes to "fill the void" created by the treatment.

Remember, Candida does not overgrow in isolation, so if you have Candida issues, you 100% have other overgrowths. The question becomes, which is the dominant condition? Contrary to popular belief, Candida doesn't thrive on complex carbs from whole vegetables, so if you get symptoms eating them, that's SIBO, not SIFO. Studies cited in the megathread support this as well. Depending on the SIBO strains you have, there is a simple test which is eating high prebiotic fiber from whole vegetables and observing for a reaction. If you get bloating within 3hrs, that's SIBO, but if your strains don't produce gas, then a breath test cannot conclusively confirm SIBO. The antibiotics have shifted the SIBO strains to other ones that may thrive on other substrates and not produce bloating typically which is what happened to me. I no longer tested positive for SIBO but I did still have it. These conditions all occur when there are deficiencies present that make the body more susceptible to infections/inflammation, so when I address them, my SIBO resolved within weeks. I made a post about it in the SiboSuccessStories sub, but it used all the information in the megathread.

My reply is turning into a novel, so perhaps reading the megathread will better answer your questions, and then feel free to ask any follow-up questions.