Early Flu Symptoms
Article Sources
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8. Fatigue, Malaise, and Mood Changes
When people become sick it will not only be apparent in their physical symptoms but also in their behavior as well. It is well documented that fatigue, malaise, and mood changes are indicators of sickness. Other behavior changes include reduced alertness, depression, irritability, lack of motivation, etc. A sudden onset may indicate an acute infection.3Eccles, Ron. “Understanding the symptoms of the common cold and influenza.” The Lancet. Infectious diseases vol. 5,11 (2005): 718-25. doi:10.1016/S1473-3099(05)70270-X
It is thought that these changes in behavior are due to responding to the discomforts of the physical symptoms of illness. There is also evidence that the actual chemical changes that occur with an immunity response can cause “sickness behavior” as well.3Eccles, Ron. “Understanding the symptoms of the common cold and influenza.” The Lancet. Infectious diseases vol. 5,11 (2005): 718-25. doi:10.1016/S1473-3099(05)70270-X
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