Why do symptoms from a cold move around your body? If the infection/virus is present in your body from the start, why can it start as, say, a sore throat. Then, the next day your throat is fine but your lungs are full of phlegm, then your lungs are fine but your sinuses are trashed, etc.?

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Why do symptoms from a cold move around your body? If the infection/virus is present in your body from the start, why can it start as, say, a sore throat. Then, the next day your throat is fine but your lungs are full of phlegm, then your lungs are fine but your sinuses are trashed, etc.?

In: Biology

The reason why you experience different symptoms on different days is mostly due to the body’s response to the infection. Once the body’s immune system detects a foreign object such as a virus, it begins producing histamines (chemicals which promote an inflammatory response). This inflammatory response helps our body’s immune system fight off the infection. However, we notice side effects such as runny nose, sore throat (due to mucous running down the back our throat), chest congestion (because the mucous has now collected into your lungs), sinus pressure/congestion initially due to the inflammatory response (swollen nasal passages – another side effect of histamines) but can turn into a bacterial infection if the immune system is left in a compromised state for too long.