In addition to diarrhea, people who had developed COVID-19 also experienced the following gastrointestinal (GI) symptoms:
* nausea
* poor appetite
* abdomen pain
* vomiting
Sometimes, medications used for COVID-19 treatment, such as the antivirals baricitinib (Olumiant) or remdesivir (Veklury), can cause you to have an upset stomach as a side effect.