PTSD

Research on the psychological effects of racism, especially on people of color, is still in the early stages. But psychologists warn that events like the Charleston shooting can cause serious stress.

When David Peters went to Iraq as an Army chaplain, his relationship with God faltered. But after years of feeling adrift, he eventually found that the trauma of war had actually deepened his faith.

There are tests for heart attacks and diabetes, but few for brain disorders. Researchers are trying to change that, but are finding the hunt for biomarkers for mental illness to be a tough slog. Tests on the market, like ones for Alzheimer's, are not conclusive.