Answer by
rachelwitt (26)
Some of the most common causes include viral infection, improper functioning bone marrow, drugs (such as radiation, steroid treatments, or chemotherapy, and several neurological diseases (such as Guillain-Barre Syndrome, multiple sclerosis, or rheumatoid arthritis). Others include aplastic anemia, AIDs, and some nerve disorders can also affect lymphocytes, causing them to have a low count.