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.
1 Acid reflux is a common condition. It occurs when stomach acids and other stomach contents back up into the esophagus. 2  Reflux symptoms are more common when lying down or bending over, after a heavy meal, and after a fatty or spicy meal.  Heartburn is the most common symptom of acid reflux.