Barry Manilow announced he is doing well after surgery to treat lung cancer, a diagnosis he shared last month.

Iconic singer Barry Manilow announced on Monday he has been diagnosed with lung cancer, but has a treatment plan in place to tackle the problem.

Sometimes a cancer diagnosis comes out of nowhere, even during a routine test for a different condition. Other times, cancer can be traced to something like a smoking habit or sun exposure. About 18 million people were diagnosed with cancer...