Tonsillectomy is a prevalent surgical procedure in otolaryngology and is recommended mainly for recurrent throat infections and obstructive sleep-disordered breathing. Post-tonsillectomy bleeding (PTB) represents the most frequent and significant complication after tonsillectomy, manifesting in approximately 5% of all cases, and it can lead to death. It is classified as primary or secondary bleeding. Primary bleeding can occur within 24 h, whereas secondary can occur at any time after the first 24 h. Primary PTB is typically attributed to insufficient hemostasis during the operation, while secondary is linked to the separation of the crust from the tonsillar bed, disregarding dietary instructions and wound separation. The risk factors of the PTB are age, reason for tonsillectomy, surgical approach, and the proficiency of the surgeon. Children with minor bleeding episodes should be closely monitored for possible development in severe bleeding. Severe PTB cases need surgical hemostasis, possible intubation, and management of hemodynamic instability.