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Loneliness isn't just a fleeting feeling, leaving us sad for a few hours to a few days. Research in recent years suggests that for many people loneliness is more like a chronic ache, affecting their daily lives and sense of well-being. Now a nationwide survey by the health insurer Cigna underscores that. It finds that loneliness is widespread in America, with nearly 50 percent of respondents reporting that they feel alone or left out always or sometimes. (Chatterjee, 5/1)

The overall national loneliness score was alarmingly high at 44 on a 20-to-80 scale, but the prevalence of social isolation among those ages 18 to 22 raises even more concern. The younger people, part of Generation Z, had loneliness scores of about 48 compared with nearly 39 for those 72 and older. The study was sponsored by insurer Cigna, which is concerned about loneliness as a societal problem but also because it's not just making us sad: It can literally make us sick. (O'Donnell and Rudavsky, 5/1)