Question: Can you 'sweat out a cold' by putting on lots of clothes and covering yourself in blankets?
Answer: Unfortunately we haven't gotten smart enough in modern medicine to cure the common cold, so a lot of people are looking for their own way to do so. One of those is to possibly cover yourself with blankets and try to sweat out a cold. Unfortunately that's not going to do it. The cold is caused by over 200 viruses, and it just takes its time up to several days to several weeks for your cold to get out of your system.
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