Background: Adolescents constitute over 21.4% of the population in India. This age group needs special attention because of the turmoil of adolescence, which they face the different stages of development, different circumstances, their different needs. Anaemia leads to poor cognitive function and motor development outcomes in adolescents. Iron deficiency anaemia is most common anaemia out of all nutritional anaemia1 Method and Material: It was a single centre cross-sectional, clinical observational study done in Department of pediatrics and Medicine, Assam Medical college and Hospital, Dibrugarh, Assam, during the period 1st june 2021 to 31thMay2022 (12 months). A sample of 200 patients were included in the study. A detailed clinical history and physical examinations were carried out. All cases are selected according to inclusion and exclusion criteria from outdoor and indoor after evaluation and informed consent was taken enrolled for study. Ethical committee permission was taken before conducting the study. Complete blood count, serum ferritin, and anthropometric measurement, food habits, socioeconomic status was taken. All data are put in predesigned proforma and analysed in Microsoft excel and Statistical Package for Social Sciences (SPSS for Windows, version 20.0, Chicago, SPSS Inc.). Results: Out of 200 adolescents prevalence of anaemia in adolescents is 51%.Prevalence of IDA in all anaemic adolescents is 34.3% and non IDA (other anaemia).IDA in male adolescents is-16.5% and that of female adolescents is 18.8%.Female adolescents of 14-18 years having higher rate of IDA. Consumption of junk food associated with high prevalence of IDA. Adolescents has low BMI developed -60% IDA, Overweight-14.2% IDA and Normal BMI-7% IDA. Upper lower and lower socioeconomic class having high prevalence of IDA.