'Mad Men's' Jon Hamm to Undergo Surgery

Getty Images

If you noticed some added rasp in Jon Hamm's voice as of late, it was no coincidence.

The Mad Men actor has a large polyp (an abnormal tissue growth) in his throat that he plans to have removed with surgery, Peopleconfirmed.

PICS: Emmy Gold! Winners Posing with Statuettes

Hamm's rep says that he will have a routine outpatient procedure to remove a single polyp from his throat.

According to the American Speech-Language-Hearing Association, polyps can be caused by a variety of factors, including singing, allergies, smoking, tense muscles, talking loudly, and drinking caffeine and alcohol, which can dry out the throat and vocal cords.

RELATED: Exclusive: Jon Hamm Covers 'Rolling Stone'

Hamm recently appeared as a presenter alongside Alec Baldwin at Sunday's Emmy Awards, awarding Veep star Julia Louis-Dreyfus with the Emmy for Outstanding Lead Actress in a Comedy Series.

The 42-year-old actor, who plays the troubled advertising executive "Don Draper" on the acclaimed AMC drama, won't begin shooting Mad Men until production resumes in 2014.