Self diagnosing an illness at home can be an impossible task. In many cases, illnesses start with mild, cold-like symptoms. As the illness progresses, it may become easier to identify what is causing you to become sick, however, by that point the symptoms are likely severe. Norovirus is a contagious viral infection that causes gastrointestinal upset. Often referred to as the “stomach flu”, Norovirus can present with mild symptoms at first and progress rapidly into ...