Common health issues in parrots include respiratory infections, which present with symptoms like nasal discharge, sneezing, or labored breathing. Feather plucking or dull feathers may indicate stress, malnutrition, or skin infections. Psittacosis, a bacterial disease, causes lethargy, weight loss, and diarrhea. Parrots may also suffer from digestive issues, indicated by abnormal droppings or vomiting. Toxicity from household substances like aerosols or certain foods can result in seizures, weakness, or sudden death. Regular veterinary checkups and a safe environment are critical for preventing these health issues.