Conclusion:
Favism is a rare cause of the co-occurrence of methemoglobinemia and
hemolysis in G6PD deficient individuals. Severity of hemolysis in G6PD
deficient individuals is dependent on the number of fava beans ingested.
It is vital to identify the presence of G6PD deficiency in patients
presenting with methemoglobinemia, as the initiation of methylene blue
in such individuals can result in a cascade of oxidative hemolysis.