Does cold weather make you sick?

Colds and flu are caused by viruses. We know that colds and flu are worse during winter months but most of us don’t know why. Here are some possible/probable reasons:

  • Many viruses replicate faster and remain infectious longer in cold weather.
  • Cold weather may change the external membrane of some viruses, making transmission easier.
  • Dry air (cold air tends to be dry) may increase the length of time a virus remains infectious. Even indoors, winter humidity plummets.
  • Inhaling cold air may affect the immune response in our respiratory tracts, making us more susceptible.
  • Cold weather dries your eyes and the membranes in your nose and throat, making it easier for viruses to attach.
  • Your immune system may be less robust in the winter due to less Vitamin D and less exercise.
  • Spending more time indoors increases exposure to others and usually brings people physically closer to one another, making contagion more likely.

Scientists don’t yet know for certain how the weather affects Covid-19, so it may be that the same rules do not apply. We do know that people on every continent and in every kind of weather are becoming infected with the Covid-19 virus. There are many variables that have yet to be fully understood.