Here's a look at some of the top health news being talked about around the U.S. and the world today:

• Watch out fashionistas. You might like the way those stilettos look, but scientists are offering a new warning about the pain the shoes can level, CNN reported. Wearing heels more than five days a week can shrink the calf muscles to the heel by 22 percent and make it painful to switch back to flats.

• New research is finding children conceived using in vitro fertilization appear to be at higher risk for developing cancer. This comes with a caveat, reports Time - it's not that these children aren't typically as healthy as those conceived "the old fashioned way." But these children are more likely to have a low birth weight linked to increased risk for other conditions.

• There is an HIV epidemic in some of America's poorest cities, according to a government report released Monday. Reported by Reuters, the report said poverty was the single most important factor linked to HIV among heterosexuals.

Tina Reed covers health and the environment for AnnArbor.com. You can reach her at tinareed@annarbor.com, call her at 734-623-2535 or find her on Twitter @TreedinAA.