Red blood cell problems

• Low red blood cell count (low hemoglobin).
  This can be caused by hemorrhage, iron deficiency, vitamnin B₁₂ deficiency, iron in the wrong form to be used, chemotherapy or kidney dialysis.
• Red blood cell clumping.
• Red blood cell deformity.
  This can be caused by iron deficiency. Sickle cell is an example of red blood cell deformity.
• Red blood cell complexed with carbon monoxide.
• Red blood cells with invaders inside.
• Bone marrow problems.

White blood cell problems

• White blood cell deficiency.
• White blood cell abnormal proportion of the various kinds: lymphocytes, macrophages, neutrophils, eosinophils, and basophils.
• White blood cell count too high caused by the presence of infection.

Platelet problems

• Low platelet count.
• Bone marrow problems.
• Hemorrhage.
• Dengue fever caused by Dengue virus.

Leukemia caused by mildew infection in the bone marrow and blood cells.