The researchers found that nearly half - 48.5% - of the 204 patients in the study said their "main complaint" was digestive issues, such as diarrhea, vomiting, and abdominal pain.
The majority of these people did not have underlying digestive diseases.
The study concluded that "clinicians should recognize that digestive symptoms, such as diarrhoea, may be a presenting feature of COVID-19".
Other digestive issues reported include vomiting (0.8 per cent) and abdominal pain (0.4 per cent).
But researchers want to get the word out that digestive issues should no longer be ignored as the fight to mitigate the spread of COVID-19 continues.
According to experts around 48,5% of patients suffer from respiratory problems as well as digestive system problems. However, it was 9.0 days for patients with gastrointestinal symptoms, including those with anorexia, compared to 7.3 days for those without digestive symptoms.
The study also found the digestive issues worsened as the severity of the disease increased. The authors found that those without digestive symptoms were almost twice as likely to be cured and discharged than patients with digestive symptoms - 60 percent versus 34.3 percent.
Around a third (34.3 per cent) of patients that did experience digestive problems were discharged by March 5, when the study stopped collecting data. These symptoms came up days before the respiratory symptoms of Covid-19.
"This virus is quite transmissible through relatively casual contact, making this pathogen very hard to contain", said James Lloyd-Smith, a co-author of the study and a UCLA professor of ecology and evolutionary biology.
"Since many children infected with COVID-19 appear to have have mild symptoms, or even no symptoms at all, it is important to practice all the social distancing, hygiene and other precautions being recommended by public health authorities to minimise transmission from children to others, including family members who may be at greater risk from the infection, such as grandparents or family members with chronic medical conditions", said Zeichner, who is working on innovative potential COVID-19 vaccines in his lab.
This can lead to liver tissue injury.
The researchers warn more research is needed to understand how the novel coronavirus affects the human body and studies with larger sample sizes are necessary.