Pyrexia due to Megaloblastic Anameia

Deficiency of vitamin B12 and / or folic acid as a cause of pyrexia, though known, is rarely reported in literature. We report a case in a 39 year old male, alcoholic who presented with fever for 6 month and was diagnosed to have megaloblastic anaemia secondary to vitamin B12 and folate deficiency. The pyrexia subsided following the intramuscular injection of vitamin B12 and oral folic acid administration.