| Abdominal | Peritonitis, pancreatitis, hepatitis, cholelithiasis, distension of viscera, bowel obstruction, visceral tumors, laparotomy |
| Cardiothoracic | Myocarditis, pneumonitis, myocardial infarction, pneumonia, bronchitis, vasculitis, vascular grafts, thoracotomy |
| Dermatologic | Pruritis, chemical and thermal burns, cellulitis, otitis, skin tumors, incision, needle puncture |
| Musculoskeletal | Restraint, arthritis, periostitis, ischemia, application of a tourniquet, tendonitis, inflammation of joints, deep chemical or thermal burns, crush, bruising, necrosis, fracture, bone graft harvest, bone tumor, osteotomy, incision, craniectomy, degenerative joint disease |
| Neurologic | Encephalitis, meningitis; crush, ligation, or transection of nerves; tumor of neural tissue; neuroma |
| Ocular | Glaucoma, uveitis, corneal ulcer, orbital blood sampling, ocular tumor |
| Orofacial | Oral tumors, temporomandibular joint disease, gingivitis, tooth extraction, pulpotomy, tooth abscess |
| Systemic | Sepsis, sickness syndrome, autoimmune diseases |
| Urogenital | Pyelonephritis, cystitis, acute renal failure, ureteral or urethral obstruction, pyometra, urinary catheterization, mastitis, ovariohysterectomy, castration, urogenital tumor, dystocia |
From: 1, Pain in Research Animals: General Principles and Considerations
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