Professors Brian Wharton and Ian Booth, from the Institutes of Child Health in London and Birmingham, warned that in people with vitamin B12 deficiency, consumption of folic acid may mask a condition called megaloblastic anaemia - which if not picked up can lead to degeneration of the spinal cord.
Frequent heartburn or acid reflux are symptoms of a condition called GERD, or gastroesophageal reflux disease, which occurs when a sphincter muscle in the lower esophagus stops working properly.
For instance, Dannenberg says, Celebrex is being tested in human trials to prevent Barrett's Esophagus, a pre-malignant condition associated with some cases of serious acid reflux (otherwise known as heartburn) that reach up into the esophagus.