Swine flu is caused by influenza viruses that regularly cause outbreaks in pigs. The 2009 outbreak derived from human, avian, and swine influenza strains. Symptoms include fever, muscle aches, coughing, and vomiting. Historical pandemics like the 1918 Spanish Flu killed millions. Homeopathic treatments were found to have much lower mortality rates compared to allopathic treatments during the 1918 flu pandemic. To reduce risk of infection, avoid contact with sick individuals and practice good hygiene. Remaining calm and maintaining a healthy lifestyle can help boost immunity.