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Typically early or early childhood, signs and symptoms of primary carnitine deficiency can appear in infant or early childhood and can include severe brain loss, a weakened and enlarged heart, nausea, muscle weakness, and low blood sugar. Some people with primary carnitine deficiency are symptomatic, indicating that they do not have any signs or symptoms of the condition. Periods of fasting or illnesses such as viral infections can cause primary carnitine deficiency. The majority of cases of Reye syndrome are related to the use of aspirin in these viral infections.
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