MSG symptom complex
noun
: a group of symptoms (such as facial flushing, palpitations, headache, sweating, and numbness or burning in or around the mouth) held to affect susceptible persons eating food heavily seasoned with monosodium glutamate
Note: While there are numerous anecdotal reports of MSG symptom complex, research has failed to establish a clear, definitive link between the consumption of MSG and adverse reactions.
… this flavor enhancer is not without its critics. Reports have cited the possibility of "MSG symptom complex," which is characterized by burning sensations, numbness, and tingling in parts of the body. 
Ocean County (New Jersey) Observer
Ocean County (New Jersey) ObserverIn consideration of the three well-designed studies described above, MSG could not be demonstrated as the causal agent of the MSG symptom complex. When ingested with meals, MSG did not elicit the adverse reactions initially reported in 1968. Tina Ng
Tina Ng
Word History
First Known Use
1995, in the meaning defined above
Medical Definition
MSG symptom complex
noun
: a group of symptoms (as facial flushing, palpitations, headache, sweating, and numbness or burning in or around the mouth) held to affect susceptible persons eating food heavily seasoned with monosodium glutamate
Note: While there are numerous anecdotal reports of MSG symptom complex, research has failed to establish a clear, definitive link between the consumption of MSG and adverse reactions.
… this flavor enhancer is not without its critics. Reports have cited the possibility of "MSG symptom complex," which is characterized by burning sensations, numbness, and tingling in parts of the body. Ocean County (New Jersey) Observer
Ocean County (New Jersey) ObserverIn consideration of the three well-designed studies described above, MSG could not be demonstrated as the causal agent of the MSG symptom complex. When ingested with meals, MSG did not elicit the adverse reactions initially reported in 1968. Tina Ng
Tina Ng