Hello and welcome to HCM,
A history of fever
along with joint pain suggests chronic inflammation of the joints- arthritis
Chronic diseases are often accompanied by anemia
or low hemoglobin
Treatment of underlying condition (joint pain) is required to correct the anemia or low hemoglobin.
Anemia due to chronic diseases is not due to any deficiency but it is actually due to certain chemicals released by inflammatory process.
Thus, consult your physician for clinical assessment, investigations and thus management.
Thanks and take care
Dr Shailja Puri