United Kingdom, March 20 -- Stanley Tucci's cancer treatment "burned out" his thyroid.

The 64-year-old actor underwent chemotherapy and radiotherapy after a tumour was discovered on the base of his tongue, and though his treatment ended several years ago, he's still feeling the effects now.

Speaking about filming the new season of 'Searching for Italy', he revealed in the latest episode of 'David Tennant Does a Podcast With...': "I would be so tired in the afternoon, like completely exhausted by one o'clock.

"I was like, 'Something's wrong with me.' Finally, when it was all over just before the last one, I had a blood test and I was like, 'I know something's f****** wrong with me.' And my thyroid was non-functioning.

"What happened wa...