Rh disease, one of the causes of hemolytic disease of the newborn
Transfusion reaction to blood transfusions
Mechanical trauma to red blood cells
Microangiopathic hemolytic anemias, including thrombotic thrombocytopenic purpura and disseminated intravascular coagulation
Infections, including malaria
Heart surgery
Haemodialysis
Parasitic
Trypanosoma congolense alters the surfaces of RBCs of its host and this may explain T. c. induced anemia

Blood loss
Anemia of prematurity, from frequent blood sampling for laboratory testing, combined with insufficient RBC production
Trauma or surgery, causing acute blood loss
Gastrointestinal tract lesions, causing either acute bleeds (e.g. variceal lesions, peptic ulcers) or chronic blood loss (e.g. angiodysplasia)
Gynecologic disturbances, also generally causing chronic blood loss
From menstruation, mostly among young women or older women who have fibroids
Many type of cancers, including colorectal cancer and cancer of the urinary bladder, may cause acute or chronic blood loss, especially at advanced stages
Infection by intestinal nematodes feeding on blood, such as hookworms and the whipworm Trichuris trichiura 
Iatrogenic anemia, blood loss from repeated blood draws and medical procedures.The roots of the words anemia and ischemia both refer to the basic idea of "lack of blood", but anemia and ischemia are not the same thing in modern medical terminology. The word anemia used alone implies widespread effects from blood that either is too scarce (e.g., blood loss) or is dysfunctional in its oxygen-supplying ability (due to whatever type of hemoglobin or erythrocyte problem). In contrast, the word ischemia refers solely to the lack of blood (poor perfusion). Thus ischemia in a body part can cause localized anemic effects within those tissues.
Eplerenone, sold under the brand name Inspra, is an aldosterone antagonist type of potassium-sparing diuretic that is used to treat chronic heart failure and high blood pressure, particularly for patients with resistant hypertension due to elevated aldosterone. It is a steroidal antimineralocorticoid of the spirolactone group and a selective aldosterone receptor antagonist (SARA). Eplerenone is more selective than spironolactone at the mineralocorticoid receptor relative to binding at androgen, progestogen, glucocorticoid, or estrogen receptors. Medical uses
Heart failure
Eplerenone reduces risk of death in patients with heart failure, particularly in patients with recent myocardial infarction (heart attack). Hypertension
Eplerenone lowers blood pressure in patients with primary hypertension. Eplerenone also reduces arterial stiffness and vascular endothelial dysfunction.For persons with resistant hypertension, eplerenone is safe and effective for reducing blood pressure, particularly in persons with resistant hypertension due to hyperaldosteronism. Central serous chorioretinopathy
Eplerenone is often prescribed for people with central serous chorioretinopathy (CSC). However, the most recent and largest randomized controlled trial showed that eplerenone has no significant effect on chronic CSC. Adverse effects
Common adverse drug reactions (ADRs) associated with the use of eplerenone include: hyperkalaemia, hypotension, dizziness, and reduced renal clearance. Eplerenone may have a lower incidence than spironolactone of sexual side effects such as feminization, gynecomastia, impotence, low sex drive and reduction of size of male genitalia. This is because other antimineralocorticoids have structural elements of the progesterone molecule, causing progestogenic and antiandrogenic outcomes.