Commonly Reported Side Effects to MSG
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Immediately after ingesting a food that contains MSG many people complain about flushing, where a person becomes hot and red in the face, neck, and chest. In addition to flushing, other "immediate symptoms" according to the Mayo Clinic's nutritionist, Katherine Zeratsky, are: headaches, sweating, tingling or numbness of the lip area, skin tightness in the face, increased heart rate and chest pain, shortness of breath, feeling weak and nauseous.