This case involves a 12-year-old female presenting with weakness, lethargy, and inability to work for 2 months. She had her first menstrual period last month that lasted 20 days and is currently having heavy bleeding on her 15th day of this period. On examination, she has pallor and a heart murmur. Laboratory tests show microcytic anemia. The presentation is suggestive of iron deficiency anemia likely due to heavy menstrual bleeding given her family history of menorrhagia. Further workup is needed to confirm the etiology and guide treatment.