O'Conner, author of a humorous guidebook for people who struggle with grammar, fields workplace disputes on a blog she cowrites, Grammarphobia.

WSJ: Grammar, a Victim in the Office

People who struggle with addictive behaviors are often in denial about their situation or are unwilling to seek treatment, and they don't recognize the negative effects their behavior has on themselves and others.

CNN: Prescription drug abuse

And a lot of people who are poor and who do struggle with food issues do tend to be overweight.

NPR: Child Hunger: Nutritious Food Tough To Afford

If local authorities do things like make sure roads are maintained, help workers get training so that they can join the oil and gas business if they want to, and protect people on pensions who often struggle with rising living costs in boom towns, everyone can win.

CNN: Make sure fracking is done right

And most people struggle with this, no matter who you are.

FORBES: The Big Problems in Your Family Relationships That Cause The Most Pain

Willis noted that there is still a stigma against people who have had cancer, and sometimes survivors struggle with when to tell other people about their cancer history -- if at all.

CNN: Study: Childhood cancer survivors less likely to marry

While diabetes represents a very large potential market opportunity, Norwood and his partners, fellow Babson MBAs Jonas Shoor and Angela Sanchez, are initially targeting 40% of the 18 million people diagnosed with Type 2 diabetes who try but struggle to consistently achieve their treatment goals.

FORBES: Type-U Wants Better Diabetes Outcomes