Does Shiitake mushroom cause diarrhea?
Shiitake mushrooms that were improperly handled can get contaminated with food borne bacteria and viruses that causes diarrhea. It is best to cook it thoroughly and refrain from eating it raw.
Consuming a large amount of Shiitake mushroom can also cause diarrhea because of the body's inability to process the contents of the mushroom all at once. Not only this, severe diarrhea can also be a symptom of an allergic reaction to Shiitake mushroom. Allergic reactions are sometimes confused as food poisoning since symptoms are quite similar.
Just remember, proper food handling, cooking and just the right consumption will decrease the chances of having diarrhea caused by mushroom.