Hi Joyce,Smelly gas is something I didn't have much of fortunately. While the citric acid allergy caused my stomach to swell out and give me a dull ache, I don't think it gave me smelly gas. My husband, on the other hand, has this problem when he eats beans, and dairy. (In this case, I am the one who feels the need to leave the room). He is lactose intolerant and dairy gives him the runs as well, although he has taken lactaid with some suceess. I find I get smelly gas with legumes(beans in particular) and prunes. Quite possibly the riper the fruits/fermented it is, the more sugar it contains and could cause this. Therefore if I had to narrow it down, I would say sugary, fermented, legumes, and dairy if you are intolerant to it, may be common causes of gas. Spicey foods might be a problem as well. While white flour, yeasted products might cause gas, I'm not sure about the smell. Perhaps eating rare red meats might be a problem too. I would say my problem with Candida caused gaseousness, as well as a stooling problem. When I was over-doing the soy products, I had problems with gas too. (Soy is a legume).If you go to the top of the BB and click on search, and type in Thyroid; you will probably find some discussion on this, as I know it was brought up on both boards before, or you can search the web. I know I have typed Thyroid to search in the past and came up with some sites, but I didn't write them down unfortuanately. What the others have said about it here, sounds accurate to me, although, I guess I don't remember the white moons on the fingernail effect, but there's really alot I don't know. I have heard something about thinning on the outside of the eyebrows, and of course the bulging eyes as some outward signs. There are many important functions effected by metabolism, and much more research is being done in this area. This must be a very aggravating, and embarrassing problem, as you have expressed. I know when I was having problems with gas and asked at a IBD meeting about it before I knew what I had; all they could suggest was simethecone, which didn't help me in the least. I think flux has mentioned Creon, which I'm not familiar with.Some Canadians on this BB have mentioned a product they have there, which I am not familiar with as well.I can watch blood from others being taken, but I have a problem watching my own being taken too. I've found it is better for me to turn my head when I'm having it done as well. Good luck in your quest for answers Joyce.------------------