Some other causes are frequent vomiting (there will, of course, be an underlying cause for that), hiatal hernia, cancer of the esophagus, foreign body in the esophagus.
I am going to refer to PetPlace.com for a cat acid reflex cure. The "cure" is to treat the underlying cause of the acid reflux. Other than that the treatment is to treat the symptoms, which includes:
- drugs to inhibit the production of stomach acid. This is the classic treatment for people with this condition. There can be side effects such as diarrhea.
- "gastric coating agents". Liquids that protect the lining of the esophagus. These are also commonly used by people with acid reflux. This page on the Peteducation.com site discusses anti-acids (note: links can sometimes become broken).
- changes in diet. This may help but cats prefer acid based diet.
- if there is a foreign body in the esophagus it is removed.
- surgery if needed.
- antibiotics may be required where there is "secondary pneumonia".
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