Background: Swine flu is an acute respiratory disease caused due to H1N1 viral infection. It became a household term in 2009 when it was first discovered to cause infection in human beings. Methods: During the period July 2015 to May, 2019, case records of 174 patients with severe influenza like illness (ILI) and respiratory complications were retrospectively studied in Department of ENT in LLRM Medical College, Meerut. Results: The mean age of patients infected with H1N1- was 45.2±15.3 years (range of 8 to 60 years). Common presenting symptoms included fever in 134, cough in 20, sore throat in 109 and breathlessness in 19 patients. Conclusion: Swine flu caused by the H1N1 virus is a highly contagious infection that can rapidly spread from person to person. Coughing and sneezing can release thousands of particles that can spread through the air.