Endorphins, the brain’s “feel good” chemicals, may explain why a drink makes us feel better — and why we often want more.

A new study finds that antidepressants do not raise the risk of suicide, but offer some protection. Kids are different.

In America, one in five people is facing a mental health issue. Worldwide, it’s the single greatest cause of disability.

Is grief a mental illness? A top medical journal questions the move to classify grief as depression.

Smoking pot can make people calm, anxious, or even psychotic. A study reveals the chemical culprit.

Struggling with the resolution to quit smoking? It gets better: Quitters report being happier and healthier.

A simple, low-cost training program helped people with depression overcome their self-defeating thought patterns.

Is alcohol good for you or bad for you? Every week brings new studies showing another benefit or new risk. Part of the problem is that our drinking behaviors vary widely, especially this time of year. Is wine better for you than distilled spirits? What about beer? What is "moderate" drinking anyway? For women, the picture is even more complicated. Sifting through the data offers some clarity.

A study of alcoholics found higher death and disease rates across the board. But the news is not all bad.

The anti-smoking drug varenicline (Chantix) can bring on depression, suicide and violence. The FDA found differently.