What causes low wbc?
Patient: What could cause a constant issue with a constant low wbc, low iron (which I have to get iron infusions every one and a half years),low lymphocytes, sores on back of head, severe muscle/joint pain mostly in morning, muscle spasms in hands and feet, memory fog to not remembering simple things.  I have been to so many doctors and they have done many tests, but they are still baffled and still testing.  Any suggestions? Doctor: Hi,Thanks for asking.Based on your query, my opinion is as follows.1. Possible syndrome or genetic cause.2. Test details necessary for full opinion. You are at present having pancytopenia, due to marrow depression.3. Bone marrow biopsy is necessary to evaluate the cause. Feltys syndrome is one of the common causes of neutropenia with rheumatoid arthirits manifestations. More details necessary.Hope it helps.Any further queries, happy to help again.