October is Breast Cancer Awareness Month, and that always makes me think of my mom.

She was diagnosed more than 30 years ago, at a time when breast cancer carried a lot of stigma.

People didn't even want to say the word cancer out loud.

Thankfully, that has changed. We've come a long way with breast cancer, and people are talking about cancer more openly.

They are getting screened.

Treatments have improved.

But despite these incredible advances, there is a new troubling trend.

More and more young people, people in their 40s, 30s, even 20s, are being diagnosed with cancers that used to be incredibly rare at those ages.

That does include breast cancer, but one of the most alarming examples is colorectal cancer.

Right now, it is the second leading cause of cancer death for women under the age of 50, and it's

projected to become number one in this group by 2030.

It is something my guest today, Dr. Kimmy Eng, has been seen up close.

She's a gastrointestinal oncologist at Dana Farber and started one of the first centers in

the country just for young adults

with colorectal cancer.

It was shocking to see that a young person perfectly fit and healthy, no risk factors,

no family history, could be diagnosed with stage four disease.

Now, as a doctor, that obviously concerns me.

As a dad of three daughters, it frightens me.

So today, we're asking the big question.

Why is this happening?

And what can we do about it?

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