Why do i get a bad stomach pains when i eat mushrooms?

i loved mushrooms and ate them often, then i started getting a bad stomach about 2 hours after, i did'nt know at the time it was because of the mushrooms and had gone alot of test without any understanding what it was, nor did the doctors know, so decided to write things down what i ate, and discoverd it was mushrooms what was causing the really bad pain, that was 6 yrs ago, i have tried them since once and got the pain back 2 hours later, so i stay well away from them.i dont know why this happend, and am intrigued, because i ate them all my life then suddenly these pains started to happen,
Answers:
Although pain is very unusual as an allergy symptom it sounds like what this is. And yes, you can develope allergies to things that you used to not have allergies to.
they could be just bloating you.certain foods agree with certain people;)
I think people just sometimes wind up not being able to eat what they like.

Maybe your stomach decided it doesn't want them anymore.
things just change, maybe your body just cant digest them well anymore. I used to eat certain foods alot and i can no longer tolerate them.
Sounds like you should do-away with mushrooms! Regardless of your like for them.
Sometimees alergies can develop over a long period of time, not sure why. Food alergies like laactose intolerance things like that.
maybe you have started reacting badly to it because your body just doesn't recognise it as good anymore or maybe the source from which you get your mushrooms these days is not of the best quality. try organic or eat small amounts and see if there is a difference.
mabey your alergic to them!! Deal with it and try not to eat them anymore!
you may bring to a laboratory the mushroom. so you would know what element in mushroom that cause d pain in your stomach
I found a lot of great information on causes of stomach pain and its treatment at http://tinyurl.com/l9k9x
Edible mushrooms are used extensively in cooking, in many cuisines (notably Chinese, European and Japanese). Though commonly thought to contain little nutritional value, many varieties of mushrooms are high in fiber and protein, and provide vitamins such as thiamine (B1), riboflavin (B2), niacin (B3), biotin (B7), cobalamins (B12) and ascorbic acid (C), as well as minerals, including iron, selenium, potassium and phosphorus. However, a number of species of mushrooms are poisonous, and although some may resemble edible varieties, eating them could be fatal. Picking mushrooms in the wild is risky —riskier than gathering edible plants— and a practice not to be undertaken by amateurs. The problem is that separating edible from poisonous species depends upon the application of only a few easily recognizable traits. People who collect mushrooms for consumption are known as mycophagists, and the act of collecting them for such is known as mushroom hunting, or simply "mushrooming".
In your case, you may be allergic to mushrooms. So you may stop consuming the same. Please see the webpage for more details on Mushrooms and Food allergy.
Where'd you get the mushrooms?If you got them in your backyard, you're lucky you lived. Who needs them anyway?Try anchovies.