It's a twist on the classic puzzle about the chicken and the egg. Which comes first — asthma or sleep apnea? 

Giving birth is hard enough, so why add a surgery to the mix? A surgery once common during childbirth may be going extinct for routine births.

To stent or not to stent? Stenting works well to prevent strokes most of the time, but it may pose risks to some patients.

A kidney cancer medication might have found its true calling: fighting thymic cancer.

Sometimes a biopsy is just a biopsy. This cancer screening procedure didn't spread cancer cells in patients, despite a myth that it might.

So what’s the verdict on using opioids to treat pain? Opioids have effectively treated many patients with chronic pain — but not all of them. Bottom line: More research is needed on when to prescribe opioids.

When a period of feeling blue gets worse or doesn't go away, you may be depressed. Getting effective treatment can be the key to your recovery.

You may have more to thank your parents for than just your height and eye color. The way they raised you might affect your heart health as an adult.

Older adults taking newer antipsychotic medications may need to be extra wary of bumps and slips.

Like Goldilocks and her porridge, people with diabetes need their blood sugar "just right." In some cases, though, diabetes treatment for older adults with other health problems can be overly strict, which may cause blood sugar problems.