Eosinophilia-Myalgia Syndrome: Symptoms
Internet URL
http://www.nemsn.org/symptoms.htm 
Sponsoring Agency
National Eosinophilia-Myalgia Syndrome Network, Inc.
Description
The varied symptoms of this disorder include severe muscle pain and abnormally high numbers of eosinophils. This disease has presented itself only in people taking the amino acid l-tryptophan and it is believed that a specific impurity (probably stemming from a genetically engineered bacterial strain) in lots of l-tryptophan made by a single manufacturer may be the cause of the syndrome.