Which sign should alert the nurse to potential complications after a tonsillectomy?

The sign that should alert the nurse to potential complications after a tonsillectomy is bright red drool. After this surgical procedure, bleeding is one of the most significant concerns, particularly the risk of postoperative hemorrhage. Bright red drool can indicate fresh blood, suggesting active bleeding from the surgical site.

In contrast, other signs mentioned might not indicate a complication. For instance, drooling of clear fluids can be a normal occurrence as patients heal and adjust post-surgery. A moderate cough can be due to throat irritation or other benign causes and doesn't necessarily signal a complication. Difficulty breathing may be serious and requires immediate attention; however, in the context of tonsillectomy recovery, bright red drool specifically points to possible hemorrhage, making it the most alarming sign for complications. Thus, vigilance for this symptom is crucial in post-operative care.