Most disease in caged birds is directly or indirectly related to malnutrition and stress. Malnutrition most often stems from what the bird eats, rather than how much it eats. Most caged birds are offered enough food, but they do not receive enough of the proper foods and in the proper proportions. Stress results from any condition that compromises a bird's state of well-being. Examples include poor husbandry, inadequate diet, rapid temperature changes, and trauma.
All owners of caged birds must understand that birds tend to 'hide" signs of illness. Birds can compensate for serious internal disease in such a way that they appear healthy externally. It is theorized that evolution has 'taught' birds to hide signs of illness to avoid being harassed and possibly killed by other birds in the same flock.
Because of this disease-masking tendency, by the time a bird owner recognizes illness in a pet bird, the bird may have been sick for 1-2 weeks. Therefore, one cannot afford to take a "wait and see" approach and hope the bird improves. Be observant and act promptly. Learn to look for subtle signs of illness, and take special note of changes in the routine and habits of your pet bird. Seek veterinary assistance promptly if you suspect illness.
Following is a list of signs of illness easily recognizable by the concerned bird owner. Alone or in combination, they signify potential illness in your bird.
Signs of Illness
Discharge from the eyes
Change in clarity or color of the eyes
Closing of the eyes
Swelling around the eyes
Discharge from the nostrils
Obstructed nostrils
Soiling feathers on head or around nostrils
Sneezing
Inability to manipulate food within the mouth
Reduced appetite or not eating at all
Fluffed-up feathers
Inactivity
Droopy wings
Decreased preening and feather maintenance
Break in the bird's routine
Changed or no vocalization (may be serious)
Weight loss
Equilibrium problems (very serious!)
Inability to perch (bird on cage bottom)
Limping or not bearing weight on 1 leg
Swollen feet or joints
Change in quality or quantity of droppings
Open-mouthed breathing when at rest (very serious!)
Tail pumping (rhythmic back and forth motion of the tail when at rest)
Lumps or masses anywhere on the body
Bleeding (always an emergency situation, regard-less of the origin)
If you suspect illness in your bird, do not delay in making an appointment with your veterinarian. Either transport your bird to the doctor's office within its cage or use some other suitable container (smaller cage, pet carrier, box). Never visit the veterinarian with your bird perched on your shoulder. This method does not provide enough protection for your pet. Whatever container you choose should be covered to help minimize the stress to your sick bird during its visit. If you take your bird the veterinarian in its own cage, do not clean it first. The material you discard could represent valuable information to the veterinarian.