Mushrooms, even edible ones, may cause diarrhea in some people. On the other hand, even some deadly poisonous mushrooms does not necessarily cause diarrhea, with the exception of the following (1):

  • Amanita ocreata (Western North American destroying angel)
  • Amanita phalloides (death cap)
  • Clitocybe dealbata (ivory funnel)
  • Hypholoma fasciculare (sulfur tuft)
  • Lactarius torminosus (woolly milk-cap)

Symptoms of mushroom poisoning may appear from 20 minutes to few hours after ingestion and may include:

  • Diarrhea
  • Vomiting
  • Headache
  • Hallucinations
  • Cold sweat
  • Fatigue

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References:

  1. List of deadly fungi – with pictures  (en.wikipedia.org)