Causes of the flu. The flu is caused by influenza virus types A, B, and C. Both type A and type B flu viruses are responsible for the seasonal outbreaks of flu. Type A flu viruses are found in many different animals, including ducks, chickens, pigs, and horses. Influenza B viruses circulate widely only among humans.
Find healthy ways to manage stress. Consider healthy, stress-reducing activities such as meditation, exercising or talking things out with friends or family. Keep in mind that unhealthy behaviors develop over time and can be difficult to change. Don't take on too much at once.
1 Dark chocolate, which is also rich in antioxidants, can also help to reduce stress by lowering levels of stress hormones in the body, according to a Swiss study in which participants ate about 1.5 ounces per day for two weeks. 2  Just avoid excess calories in your diet by not overindulging in chocolate, advises Meyerowitz.