Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Autoimmune hemolytic anemia ?
    ### Response:
    Autoimmune hemolytic anemia (AIHA) occurs when your immune system makes antibodies that attack your red blood cells. This causes a drop in the number of red blood cells, leading to hemolytic anemia. Symptoms may include unusual weakness and fatigue with tachycardia and breathing difficulties, jaundice, dark urine and/or splenomegaly.
    