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.
Sometimes acid reflux progresses to GERD, a more severe form of reflux. The most common symptom of GERD is frequent heartburn. Other signs and symptoms may include regurgitation of food or sour liquid, difficulty swallowing, coughing, wheezing, and chest pain â especially while lying down at night.