Polycystic ovarian syndrome is one of the gynaecological problems during adolescence. It is one of the most common endocrine disorder affecting 5-10% women worldwide (4).This study was conducted to study the clinical and biochemical features of PCOS because it is important to screen and diagnose adolescent PCOS in order to prevent the development of future infertility, type II diabetes mellitus, cardiovascular disease, metabolic syndrome and endometrial cancer in PCOS patients. Material and methods: Cross sectional study conducted on 50 patients attending the OPD and IPD at Dr. SusheelaTiwari Govt. Hospital for menstrual irregularities and other gynaecological problems. Conclusion: Out of the PCOS patients studied at SusheelaTiwari Hospital , Haldwani,25% were overweight and 8% were obese,residing in urban areas,Waist hip ratios of 62% patients in the study group were >0.80.62% patients had menstrual irregularities and 44% patients had clinical features of Hyperandrogenism. However, biochemical Hyperandrogenism was seen only in 10% of patients.20% and 12% patients had a family history of Diabetes Mellitus and Hypertension respectively. Hypothyroidism also accompanied a small percentage of patients with PCOS, the percentage being 20%. LH/FSH ratio was raised in 14% patients and ultrasound features of PCOS were found in a large group of patients, the percentage being 60%.