Tonsillectomy is the surgical removal of the tonsils, two oval-shaped pads of tissue at the back of the throat — one tonsil on each side.
A tonsillectomy was once a common procedure to treat infection and inflammation of the tonsils (tonsillitis). Today, a tonsillectomy is usually performed for sleep-disordered breathing but may still be a treatment when tonsillitis occurs frequently or doesn't respond to other treatments.