Ears- Itching, redness, discharge, or odor:
Ear infection, ear mites, allergies, wax buildup, tumor - Swelling:
Ear cancer, abscess, hematoma - Hearing loss:
Deafness
Eyes- Discharge, redness, or swelling:
Eye infection, allergies, conjunctivitis (pink eye), upper respiratory infection, corneal disorders, dry eye, feline infectious peritonitis, feline AIDS, leukemia, distemper, glaucoma, eye defects, eye injury - Clouding:
Eye infection, eye defects, corneal disease, tumor - Jaundice (yellowing):
Liver disease, feline infectious peritonitis, infection, heart tumor, stem cell disorders
Nose- Bleeding:
Injury, foreign object stuck in nose, infection, tumor, parasites, clotting disorder, cancer - Sneezing or discharge:
Bacterial, fungal, or viral infections (especially feline herpes virus and feline calicivirus), upper respiratory infection, allergies, feline infectious peritonitis, feline AIDS, leukemia, chlamydia, bordetella
- Abnormal gum color:
Heart disease, heart failure, anemia, cancer, distemper, feline AIDS, leukemia, kidney disease, poisoning, upper respiratory infection - Bad breath:
Gingivitis, gum disease, mouth ulcer, cavities, tumor, gastrointestinal problems, liver disease, kidney disease, retained deciduous teeth - Bleeding
Gingivitis, mouth cancer, ulcer, tumor, jaw fracture - Difficulty breathing or coughing:
Pneumonia, anemia, heartworm disease, upper respiratory infection, hyperthyroidism, feline infectious peritonitis, heart problems (disease, failure, murmur, or cancer), poisoning, bronchitis, asthma, lung cancer, fungal infections, hernia, foreign object in throat - Difficulty swallowing:
Dental infection, mouth infection, hyperthyroidism; tonsil, thyroid, or throat cancer; tonsillitis, sore throat, foreign object in throat - Drooling:
Rabies, upper respiratory infection, feline AIDS, mouth, tonsil, or tongue cancer, tooth fracture, kidney disease, ulcers, gum disease, cavities, heat stroke, epilepsy - Vomiting:
Swallowing something indigestible, rushed eating, distemper, intestinal parasites, allergies, heartworm disease, infection, poisoning, tonsillitis, inflammatory bowel disease, leukemia, kidney disease, liver disease, pancreatitis, epilepsy
- Pain:
Urinary tract or intestinal obstruction, bladder rupture, trauma, poisoning, feline infectious peritonitis, liver disease, cancer - Swelling or distention:
Foreign body in gastrointestinal tract, tumor, hernia, heart disease, feline infectious peritonitis
- Blood in urine:
Urinary tract infection, kidney disease, cancer, diabetes, feline urinary tract disease, fungal infection - Frequent, painful, or strained urination:
Urinary tract infection, hyperthyroidism, diabetes, bladder stones, feline urinary tract disease, liver disease, kidney disease, cancer - Incontinence or going outside of the litter box:
Aging, kidney disease, urinary tract infection, feline urinary tract disease, bladder stones, congenital defect of the uterus, spinal cord injury
- Blood in stool:
Stomach or intestinal bleeding, inflammatory bowel disease, irritable bowel syndrome, poisoning, parasites, infection, ulcer, leukemia - Constipation:
Dehydration, hairballs, tumor, colitis, feline urinary tract disease - Diarrhea:
Food allergies/intolerance, heartworm disease, inflammatory bowel disease, kidney disease, irritable bowel syndrome, colitis, hyperthyroidism, parasites, cancer, pancreatitis
- Chewing, licking, scratching, flaking
or redness:
Parasites, allergies, dry skin, skin irritation, infection, kidney disease, pain, anxiety, boredom - Hair loss:
Hyperthyroidism, parasites, allergies, skin irritation, ringworm, alopecia, ulcer, infection
Behavioral
- Aggression:
Rabies, poisoning - Disorientation or loss of balance:
Rabies, vestibular disorder, hypoglycemia, high blood pressure, liver disease, brain injury, brain parasites, epilepsy - Increased thirst:
Kidney disease, hyperthyroidism, liver disease, diabetes, bacterial infection, poisoning - Lack of appetite:
Upper respiratory infection, heartworm disease, pancreatitis, hyperthyroidism, feline infectious peritonitis, feline AIDS, kidney failure, cancer, liver disease, intestinal problems, parasites, pneumonia, distemper, toothache, recent vaccination - Lethargy, weakness, depression, or hiding:
Heart disease, heart failure, heart murmur, heartworm disease, cancer, feline infectious peritonitis, feline AIDS, feline herpes, kidney failure, lyme disease, anemia, pneumonia, infection, arthritis, hip dysplasia, poisoning, tumor, pancreatitis, diabetes, liver disease, distemper
- Shaking:
Ear mites, ear infection, kidney stones - Swelling:
Allergies, insect bite - Tilting:
Rabies, vestibular disorders, meningitis, tumor
Other- Fever:
Bacterial, viral, or fungal infection, distemper, upper respiratory infection, feline infectious peritonitis, injury, tumor, pancreatitis - Lameness or limping:
Injury, arthritis, infection, lyme disease, hip dysplasia, cancer, muscle disorder - Paralysis:
Spinal cord injury, rabies, heart disease, heart failure, tumor, poisoning - Seizure:
Poisoning, head injury, kidney failure, liver failure, epilepsy