My theory on how i got H2S (Hydrogen Sulphide) SIBO
Hi everyone, just thought i would share my experience with H2S SIBO for anyone who suspects they may have it, how to avoid it, and how to manage if you do have it.
So to start with, I am Lactose intolerant (but i didn't know this for many years) not so much intolerant to milk, but i was very intolerant to cheese. 30 mins after eating cheese i would be running to the toilet. Many years of this, i noticed the stools becoming increasingly pale/yellow and fatty. I also ate alot of sulphuric foods, lots of garlic, onions, eggs, sprouts etc.
I believe a high fat diet + intolerance + sulphuric foods is what causes this bacteria to thrive.
Eventually, i started getting more issues Eggy belching, lots of fatigue, diarrhoea, stomach ache. At this point i realised my issues was related to diet, as i was mainly feeling rubbish at the weekends. but could not pinpoint the cause, and my diet continued and bacteria continued to progress.
Then, my need to go toilet became more urgent, my ability to absorb all types fat became much worse. You wake up feeling like a lump of food is still sitting in your stomach undigested, cramping, bloating, distinctive smelling flatulence.
Finally you reach the next stage, it starts with a stomach ache, it becomes inflammed, and you get what the NHS says is pancreatitis. My theory is that because you cant digest the bile acids from digesting the fat, what happens is you get clogged up inside and fatty acids start to block your pancreas off, or that the toxic gas is now strong enough and starting to have some effect.
Now, you have the long road of the NHS, they cant find anything, and you have a 60+ week wait. And to top it off, they don't have the equipment to detect H2S yet. Going to your GP they are pretty unhelpful.
I suggest you go private. The only place i found was "the functional gut clinic" they can test for this, you may have to travel a long way though. You can either pay for it all, or take your evidence to a NHS gastro specialist to review if you are willing to wait for antibiotic treatment.
In the meantime, i find the best way of preventing the issues is to reduce your fat intake right down, prefferably no more than 30g a day. Avoid all sulphuric foods, mince meat causes alot of cramping (even the 5% fat) so i would stick with chicken or turkey. Get yourself an intolerance test to avoid all intolerances, and check for any vitamin deficiency.
Helpful things to try: Oregano oil, Lactoferrin, Tumeric
Hope people here find this helpful in solving their own issues of H2S SIBO Thanks for reading :) Chrono
Posted Nov 14, 2025, 6:55 PM UTC