| Disease | Ileal lesions | Severity of lesions in cecum/colon | Enlargement of ileocecal nodes | Other features that may occur and comments |
| Salmonellosis | Mild | +++ | +++ | Pneumonia, hepatic foci, rectal stricture. |
| Swine dysentery | Usually absent | ++ | ++ | Mucohemorrhagic feces common. |
| Ileitis | Proliferative, hemorrhagic or necrotic |
++ Lesions can be restricted to proximal cecum/colon |
+++ | Ileum often rigid and hose-like. Cases often sporadic in herd. |
| Hemorrhagic bowel syndrome (HBS) | Transmural congestion of intestine with unclotted blood in lumen | Colon may have blood contents | Sometimes edema in lymph nodes | Cause unknown; must be differentiated from intestinal volvulus. |
| Gastric ulcers | Dark, tarry blood in intestine or colon | No mucosal lesions in intestine or colon | Lymph nodes normal | Hemorrhage may be intermittent, therefore blood may not be present in stomach. One must examine the pars oesophagea for ulceration. |
Key:
* These diseases usually are seen in grower pigs. Other enteric diseases occur but usually are in younger, smaller pigs.
++ = Mild
+++ = Marked