Chinese experts have warned about newly discovered symptoms of COVID-19 that include diarrhea, loss of appetite and nausea.

In three hospitals, 204 infected cases have been tested and results have been published in the American Journal of Gastroenterology.

Experts said 48.5% of the cases suffer from digestive system problems as well as respiratory problems.

In some cases with only diarrhea, no traces of high fever or coughing are observed.

In cases with digestive system problems, the process from the first symptom to being hospitalized is 1.5 days longer – nine in total – than cases with no digestive system problems.

The study also said cases with only respiratory problems recover faster than those with both.

The novel coronavirus, which causes the COVID-19 disease, emerged in Wuhan, China, last December, and has spread to at least 163 countries and territories. The World Health Organization declared the outbreak a pandemic.

Out of more than 246,000 confirmed cases, the death toll now exceeds 10,000, and over 86,000 have recovered, according to data compiled by the U.S.-based Johns Hopkins University.

Despite the rising number of cases, most who become infected suffer only mild symptoms and recover.