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Chronic gastritis is often characterised by persistent [[vomiting|vomiting]] of variable frequency and appearance. The underlying cause is unknown but chronic gastritis can be classified into one of four types according to its histological appearance.
Chronic gastritis is often characterised by persistent [[vomiting|vomiting]] of variable frequency and appearance. The underlying cause is unknown but chronic gastritis can be classified into one of four types according to its histological appearance.
1)'''Lymphocytic-plasmacytic gastritis''' which may be an immune response to numerous antigens. [[Helicobacter|''Helicobacter felis'']] has been suggested as a cause for such a reaction in dogs and cats.
1) '''Lymphocytic-plasmacytic gastritis''' which may be an immune response to numerous antigens. [[Helicobacter|''Helicobacter felis'']] has been suggested as a cause for such a reaction in dogs and cats.
2)'''Eosinophilic gastritis''' which may result from an allergic reaction to food antigens.
2) '''Eosinophilic gastritis''' which may result from an allergic reaction to food antigens.
3)'''Atrophic gastritis''' which is thought to result from an immune reaction and/or chronic gastric inflammation.
3) '''Atrophic gastritis''' which is thought to result from an immune reaction and/or chronic gastric inflammation.
4)'''Granulomatous gastritis''' which may be caused by ''Ollulanus tricuspis'' in cats.
4) '''Granulomatous gastritis''' which may be caused by ''Ollulanus tricuspis'' in cats.
Also occurs in pigs and cattle, usually following a parasitic infection. In pigs it is present in up to 30% of pig herds and is most often caused by Redworms (''[[Hyostrongylus rubidis]]'').It mostly affects sows, and in small numbers produce little pathology, but large numbers cause [[Thin Sow Syndrome|thin sow syndrome]]. In cattle [[Ostertagiasis|Ostertagiasis]] produces a condition similar to thin sow syndrome.
Also occurs in pigs and cattle, usually following a parasitic infection. In pigs it is present in up to 30% of pig herds and is most often caused by Redworms (''[[Hyostrongylus rubidis]]'').It mostly affects sows, and in small numbers produce little pathology, but large numbers cause [[Thin Sow Syndrome|thin sow syndrome]]. In cattle [[Ostertagiasis|Ostertagiasis]] produces a condition similar to thin sow syndrome.