7 Signs That You May Have a Soy Allergy 1. Nausea, bloating, cramps, diarrhea, vomiting. 2. Flushed face, hives or a rash, red and itchy skin. 3. Swelling of the eyes, face, lips, throat, and tongue. 4. Trouble breathing, speaking or a drop in blood pressure. 5. Rapid heartbeat (palpitations), loss of consciousness. 6. Anxiousness, […]