Scientists have discovered that post-traumatic stress disorder (PTSD) can be tested by measuring magnetic fields in the brain. 74 US war veterans were tested and the technique was successful 90% of the time. Conventional brain scans do not show if a person has PTSD and this is the first time that such a test has worked.
PTSD is caused by being involved in or witnessing traumatic events such as natural disasters, wars or violent crime and can cause distressing symptoms such as flashbacks, anger, general nervousness and nightmares that can drag on for many years.
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