Share on Pinterest Experts say a person with mild COVID-19 symptoms can quickly become seriously ill and need to be hospitalized. Getty Images People with mild symptoms of COVID-19 can quickly become seriously ill. Experts are warning that mild COVID-19 symptoms can quickly escalate to serious, possibly life threatening symptoms. While the majority of people with COVID-19 will either have mild or no symptoms, doctors say even those with mild symptoms should be on the lookout for worsening symptoms that could become serious. Treating mild symptoms While there isn’t a treatment that can stop symptoms from progressing from mild to severe, Dr. William Schaffner, an infectious disease expert at Vanderbilt University in Tennessee, says there are things people with mild symptoms can do at home to feel better.