Abdominal pain or back pain
Intravascular hemolysis
Renal failure (both from intravascular hemolysis causing AKI and chronic hemolysis causing iron deposition in kidneys)
DVT, thrombosis of hepatic/intraabdominal/cerebral veins, arterial thrombosis
Bone marrow failure leading to aplastic anemia
Myelodysplastic syndrome (MDS) or myeloproliferative disorders
Acute leukemia
Esophageal spasm
Crampy abdominal pain
Impotence/erectile dysfunction
May progress to aplastic anemia
Paroxysmal nocturnal hemoglobinuria
Disseminated Intravascular Coagulation 
Hereditary spherocytosis
Thrombotic Thrombocytopenic Purpura 
Myelophthistic anemia
Hemolytic Uremic Syndrome 
Thalassemia
HELLP syndrome