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AT JABAL AMMAN mental-health clinic, perched atop a hill in the old town of Jordan’s capital, Walaa Etawi, the manager, and her colleagues list the countries from where they see refugees—and what ails them. There are Iraqis (many with post-traumatic stress, says a nurse), Syrians (a lot of depression), Sudanese (anxiety), and at least ten other nationalities. By official estimates, 1.4m people have poured into Jordan from Syria’s civil war alone. Disaster-relief groups like the International Medical Corps (IMC), which runs the Jabal Amman clinic, came to help.

In the past two decades care for mental distress in such emergencies, whether wrought by conflict or natural calamity, has become an immediate priority—on a par with shelter and food. And what has been learnt from disasters has inspired new, pared-down mental-health care models that can be deployed quickly to help lots of people. In parts of Indonesia, Sri Lanka, the Philippines and elsewhere these models became part of rebuilt health-care systems. They are now being picked up in America and Europe, as people wake up to the scale of mental-health problems and the shortage of specialists to treat them.

In Jordan IMC has the luxury of hiring psychiatrists and mental-health nurses. But in most countries suffering civil wars, earthquakes or typhoons a single mental...