Mushroom allergy symptoms resemble the symptoms of many other food allergies. They arise because your body considers the mushroom an invading toxin and responds accordingly. Allergies can be fatal and require medical attention. If you experience any of these symptoms (noted by the AMA and other organizations) after consuming mushrooms, call a doctor immediately. He can prescribe an antihistamine or similar medication to provide relief.
Symptoms of mushroom allergies usually arise within 20 to 30 minutes of first ingesting the fungus.
Your skin may begin to itch or break out in hives once the mushroom is in your system.
Your hands and feet may swell and become painful and tender to the touch.
A mushroom allergy may cause your air passages to close, resulting in shortness of breath or a constricted feeling in your chest.
Gastrointestinal reactions to mushroom allergies can run the gamut from nausea to vomiting to diarrhea to stomach cramps.