The Virginia Department of Health also did an investigation and told CNN it found no contributing environmental factors and concluded the students ' symptoms , though varied , were consistent with a social phenomenon called `` mass psychogenic hysteria , '' which suggests real symptoms but no biological cause . ` ` conversion disorder '' Eye twitching , crying , verbal outbursts . Clinic says it is caused by ` ` stressors that provoke a physical reaction '' Mayo Clinic says young people are much more likely to get conversion disorder .
` ` conversion disorder '' Eye twitching , crying , verbal outbursts . Clinic says it is caused by ` ` stressors that provoke a physical reaction '' Mayo Clinic says young people are much more likely to get conversion disorder .