India is experiencing a surge in seasonal flu cases and flu-like illnesses as the year ends. Experts attribute this annual rise to increased travel during the holiday season, leading to crowded, poorly ventilated environments like airports and trains. Additionally, colder weather encourages people to stay indoors, further facilitating the spread of respiratory viruses. Common symptoms include fever, sore throat, cough, and fatigue, with potential for worsening in individuals with pre-existing lung conditions.