A cold is usually caused by a viral infection, which causes generalized fever and muscle pain due to the release of pyrogen into the bloodstream, and should be treated symptomatically with acetaminophen or ibuprofen suspension. If the fever does not subside, it is recommended to check the blood count and C-reactive protein to understand whether there is a bacterial infection, and if the blood count is elevated, antibiotics should be used, which are generally resistant to penicillin, cephalosporins or macrolides can be used. Fever can easily cause dehydration, so it is important to replenish water in a timely manner, drink more water, keep indoor air circulation, eat more vegetables and fruits, quit smoking, and take rest.