What Causes Upset Stomach Diarrhea And Headache?

What Causes Upset Stomach Diarrhea And Headache? These symptoms can be related to infections of the digestive tract like gastroenteritis or to foodborne illnesses like food poisoning. Dehydration from nausea and vomiting can often cause headache. Are diarrhea and headaches symptoms of Covid-19? Research consistently shows that approximately 5-10% of adults with COVID-19 report GI