Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) hereditary spherocytosis ?
    ### Response:
    Hereditary spherocytosis is a condition that affects red blood cells. People with this condition typically experience a shortage of red blood cells (anemia), yellowing of the eyes and skin (jaundice), and an enlarged spleen (splenomegaly). Most newborns with hereditary spherocytosis have severe anemia, although it improves after the first year of life.
    