I am 51-year-old patient with a 10-year history of hiv. I am on lopinavir+ritonavir +lamivudine+zidovudine tablets along with ayurvedic medicine. I am also on cardiac medicine for enlargement of heart, which are lesilactone, digoxin and ecosprin. Presently my viral load is at undetected level and cd4 is 266 I am having chronic back pain in lumbar region and coccyx, which typically subsides with use elemental iron. I request you to kindly help me to diagnose this and suggest me treatment ?