Can you get sick from slimy mushrooms?
Likewise, are slimy mushrooms OK to eat?
They're slimy. The number one rule-of-thumb when it comes to detecting freshness is that when mushrooms are slimy, they're not good to eat anymore. This could be from sitting in the fridge for too long. While they aren't definitively dangerous at this point, it's still a good common kitchen practice to toss them.
Accordingly, what happens if you cook slimy mushrooms?
Sometimes, a few of the mushrooms may look bad or feel slimy while the rest seem fine. A slight amount of slime or a wet feel on one or two mushrooms might not cause harm if they're cooked right after cleaning them, but it's best to avoid them because they could cause food poisoning or at the very least, nausea.
A slimy film is the telltale sign of a spoiled mushroom.