Sign Minor bleeding--broken toenail, cutting the quick in the nail or pulling out a blood feather.
What you should do: Apply direct pressure, use a coagulant such as Cauter-Gel or cornstarch.

Sign: Major blood loss.
What you should do: Apply direct pressure to the site of the bleeding and transport bird to avian vet or emergency clinic. A healthy bird can lose up to 30 percent of its blood volume with minimal problems.

Sign: Tail bobbing and audible wheezing, open-mouth breathing.
What you should do: Could be a sign of severe distress or respiratory disease, take to an avian vet. If the bird has been vigorously playing or had a stressful event, the bird should return to norman after a few minutes.

Sign: The bird is regurgitating to your or a favorite toy.  
What you should do: This is a sign of courtship. No medical treatment necessary unless persistent regurgitation does not seem to have anything to do with breeding or courtship, then take to an avian vet to be evaluated.

Sign: Vomiting -- found on the bottom of the cage as a foamy mass with food particles, and dried, caked-on food on your bird's nostrils and beak.
What you should do: Take to vet for observation as can be a sign of infection, disease or toxicity.

Sign: Feather picking or plucking.
What you should do: Could be a behavioral disorder, food allergy, skin infection other medical-based disease. Take to an avian vet for evaluation to rule our medical condition. If medical condition is rules out, consult with an avian behaviorist.