Edema is divided into the following types according to the etiology: i. The most common is cardiogenic edema, which is caused by heart failure, pericardial effusion, and pericardial inflammation. II. Nephrogenic edema, which is commonly caused by renal insufficiency, uremia, and nephrotic syndrome. Hepatogenic edema, commonly caused by liver cirrhosis, viral hepatitis. D. Malnutritional edema, commonly associated with hypoalbuminemia. V. Connective tissue disease edema, common in scleroderma, dermatomyositis, systemic lupus erythematosus. Endocrine edema, commonly associated with hypothyroidism and Cushing’s syndrome. VII. Idiopathic edema.