For viruses, classification is normally based on type of nucleic acid, morphology, presence or absence of an envelope and replication properties. A number of families is recognized, with the family name ending in -viridae, e.g. Poxviridae (double-stranded DNA, enveloped animal viruses).
Heartburn, regurgitation, and dyspepsia are a few of the most common acid reflux symptoms. Heartburn. Also called acid indigestion, heartburn is a burning pain or discomfort that can move up from your stomach to the middle of your abdomen and chest. The pain can also move into your throat.
Symptoms and Causes. Both acid reflux and bile reflux may afflict the same person, which can make diagnosis a challenge. But the stomach inflammation that results from bile reflux often causes a burning or gnawing pain in the upper abdomen that is not felt with acid reflux, according to experts at the Mayo Clinic. Other symptoms of bile reflux may include frequent heartburn (the main symptom of acid reflux), nausea, vomiting bile, sometimes a cough or hoarseness and unintended weight loss.