Lung cancer is a killer, claiming the lives of more Americans than any other type of cancer.

That’s because it’s often found late, when it has already spread, says Dr. Humberto Choi, a pulmonologist at the Cleveland Clinic who specializes in thoracic oncology, the diagnosis and treatment of cancer in the chest.

The warning signs can be mistaken for another condition, he notes.

“The disease can be silent. Sometimes, someone may not have symptoms at all. And when symptoms develop, they can be very nonspecific. So someone may think, ‘It's just my sinus infection or a sinus allergy,’” Choi tells TODAY.com.

“It takes a while for someone to seek help.”

More people die of lung cancer than of colon, breast and prostate cancers combined, according to the American Cancer Society . November is

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