8.1.5.1 Monosodium glutamate (MSG)-induced headache

Previously used term:
Chinese restaurant syndrome.

Coded elsewhere:
An episode of migraine triggered by monosodium glutamate ingestion is coded as the appropriate subtype of 1. Migraine.

Diagnostic criteria:
A. Any headache fulfilling criterion C
B. Monosodium glutamate (MSG) has been ingested
C. Evidence of causation demonstrated by all of the following:

    1. headache has developed within 1 hr of MSG ingestion
    2. headache has resolved within 72 hr after MSG ingestion
    3. headache has at least one of the following five characteristics:

      a) bilateral
      b) mild to moderate intensity
      c) pulsating quality
      d) associated with flushing of the face, pressure in the face and chest, burning sensations in the neck, shoulders and/or chest, dizziness and abdominal discomfort
      e) aggravated by physical activity

D. Not better accounted for by another ICHD-3 diagnosis.

Comment:
8.1.5.1 Monosodium glutamate (MSG)-induced headache is typically pressing/tightening or burning in quality, but may be pulsating in people with 1. Migraine. It is commonly associated with flushing of the face, pressure in the face and chest, burning sensations in the neck, shoulders and/or chest, dizziness and abdominal discomfort.