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 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. Your stomach is protected from the corrosive effects of stomach acid. If your lower esophageal sphincter doesnât prevent your stomach acid from leaking out of your stomach and into your esophagus, you will experience a painful burning sensation in your chest.