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→Diagnosis
====Acute====
====Acute====
*Depression
*Depression
*Abdominal pain, episodes of colic
*Abdominal pain, episodes of [[:Category:Colic in Horses|colic]]
*Abdominal distension
*Abdominal distension
*Dysphagia
*Dysphagia
*Sudden death
*Sudden death
Rectal examination reveals dry faecal balls, large colon impaction and distented loops of small intestine. Gut sounds are reduced or absent due to gastrointenstinal atony. Passage of a stomach tube often results in gastric reflux of up to 20L.
[[Rectal Examination in the Horse|Rectal examination]] reveals dry faecal balls, large colon impaction and distented loops of small intestine. Gut sounds are reduced or absent due to gastrointenstinal atony. [[Nasogarstric Intubation - Horse|Passage of a stomach tube]] often results in gastric reflux of up to 20L.
Subtle signs of ptosis and dry rhinitis should be noted.
Subtle signs of ptosis and dry rhinitis should be noted.
====Chronic====
====Chronic====
*Progressive eaciation
*Progressive emaciation
*Dehydration
*Dehydration
*Depression
*Depression
*Intermittent colic
*Intermittent colic
Other signs such as tachycardia, sweating, dyspagia and muscle tremors are present but usually less severe than in acute grass sickness. The nasal passages are frequently blocked with dried mucopurulent discharge.
Other signs such as tachycardia, sweating, dysphagia and muscle tremors are present but usually less severe than in acute grass sickness. The nasal passages are frequently blocked with dried mucopurulent discharge.
===Biopsy===
===Biopsy===
===Pathology===
===Pathology===
On post mortem examination the [[Forestomach - Anatomy & Physiology|Stomach]] and [[Small Intestine - Anatomy & Physiology|small intestine]] may be distented and contain large amounts of yellow fluid.
On post mortem examination the [[Forestomach - Anatomy & Physiology|stomach]] and [[Small Intestine - Anatomy & Physiology|small intestine]] may be distented and contain large amounts of yellow fluid.
There is an abrupt change in the [[Large Intestine - Anatomy & Physiology|large intestine]], where no fluid is present and the contents are very dry and mucoid.
There is an abrupt change in the [[Large Intestine - Anatomy & Physiology|large intestine]], where no fluid is present and the contents are very dry and mucoid.