Abnormal uterine bleeding is one of the most common gynecology problems. 30% of women will experience abnormal uterine bleeding, mostly during adolescence and perimenopause. It has a negative impact on the quality of life and represents financial burden for the health system. Abnormal uterine bleeding can be caused by structural or nonstructural causes.,The International Federation of Gynecology and Obstetrics introduced a classification system which classifies abnormal uterine bleeding on the suspected etiology: PALM-COEIN (polyps, adenomyosis, leiomyoma, malignacy and hyperplasia-coagulopathy, ovulatory dysfunction, endometrial causes, iatrogenic and not yet classified). For diagnosis of abnormal uterine bleeding, it is important to take a good medical history where we need to ask about the frequency, volume, duration and regularity of bleeding, do a gynecological examination and imaging and laboratory tests. Gynecological,laboratory and ultrasound examination helps us define the causes of abnormal uterine bleeding such as fibroids, adenomyosis, endometrial thickness, and ovarian anomalies. Treatment depends on multiple factors such as the etiology of abnormal uterine bleeding, fertility desires, the clinical stability of the patient and other medical comorbidities. Treatment can be conservative medical therapy and surgical. For acute abnormal uterine bleeding, hormonal methods are the first-line in medical management. Based on the acronym PALM-COEIN (polyps, adenomyosis, leiomyoma, malignacy and hyperplasia-coagulopathy, ovulatory dysfunction, endometrial causes, iatrogenic and not yet classified) for etiologies of chronic abnormal uterine bleeding, there are specific treatment options for each category, though surgical treatment is mostly used for symptomatic structural causes of bleeding.