Background: AUB is the most common problem affecting the women of the reproductive age group and directly affecting their life by having a significant impact on their physical, social, and emotional aspects. According to most International Federation of Gynecology and Obstetrics (FIGO) was devised as the most acceptable system of nomenclature and classification of AUB in the year 2011, namely PALM__ampersandsignndash;COEIN classification to describe AUB in the year 2011. The objective of the present study was to find out causes and to categorize the causes of AUB as per the FIGO system in terms of the structural (PALM) and functional (COEIN) components in the Indian scenario. Method: The present study was done retrospectively carried out on 120 non-pregnant reproductive age women with complaints of AUB at Datta Meghe Medical College, Shalinitai Meghe Hospital and Research Centre, Wanadongari, Nagpur, during the period May 2019 to April 2020. The study aims to conduct the efficiency and practicality of the PALM-COEIN classification system for a patient showing AUB at the outpatient department. Results: It is a retrospective study carried out on 120 patients presenting with complaint of abnormal uterine bleeding. Upon classification of the patients according to the PALM-COEIN classification, Leiomyoma was found to be the most common cause of AUB in patients with gynae OPD (n=38, 31.6%) was followed by ovulatory dysfunction was followed by (n=28, 23.4%), Adenomyosis (n=22, 18.4%), Endometrial causes (n = 13, 10.82%), Polyp (n=8, 6.6%), Not yet classified (n=7, 5.8%), Iatrogenic (n =2, 1.6%), Malignancy and Coagulation (n = 1, 0.83%). About 69 (57.5%) patients had structural (PALM) causes of AUB in our study and 51 (42.5%) are non-structural cause (COEIN). Conclusion: The PALM COEIN classification system of AUB for determining diagnosis of causes and helps us to facilitate proper management of women with a broad group of disorders included under acute and chronic AUB Leiomyoma was found to be the most common cause of AUB in patients with gynae OPD after classification of the patients according to the PALM-COEIN classification.