Michael Douglas was on the David Letterman Show last night, August 31, 2010 where he discussed his struggle with cancer.

Douglas just completed his first week of chemotherapy and radiation.

After being checked for what Douglas felt was a sore throat, it was discovered that he had stage-four cancer.

According to Douglas, since the cancer is still above the neck, he has an 80 percent or better chance for a full recovery.

When Letterman asked what could have contributed to his condition, Douglas acknowledged that he used to smoke and drink.

“This particular type of cancer,” said Douglas, “is caused by alcohol and drinking.”

Check out the video below.