Thanks for the query.
A common cold usually lasts for a week and the immunity fights it out without any medications. In case it persists more than a week and you experience fever, chills, sore throat, headache, etc you will have to see a doctor. They indicate a sign of infection which needs antibiotic therapy. Drink plenty of water, try steam inhalations and also try warm saline gargles to make you feel better. Vitamin C supplements or fruits rich in vitamin C are known to build up immunity to fight against cold and other diseases.
Hope this helped.
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