he s farmer 51 years old. doctors diagnosed he got stone ureter 9x20mm, blood text have low red blood cells, low hemoglobin. he smoke, drink usually. he got pain 10 days ago,pain in the side and back, below the ribs, not to much but make him noted. drink water 1,5 liter per day. normal urine, no pain on urination. i want to know is why red blood cells and hemoglobin is low. what mechanism make it low. thank :)