The US Army has invested $2 million in research to test a promising one-shot injection to treat post-traumatic stress disorder.

The injection – known as stellate ganglion blocks – was invented in 2006, and is used to ‘reset’ the nervous system in soldiers tormented by past trauma.

Now the Pentagon is backing a major study carried out at three Army medical centers to investigate the treatment.

The method is simple: a physician injects a dose of local anesthetic into the right-hand side of the neck, hitting and numbing a cluster of nerves called the stellate ganglion, which connect the body to the brain.

Somehow – for reasons that remain unclear to scientists – this injection seems to reset the nervous system.

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