Have you ever heard of PTSD? The abbreviation stands for the post-traumatic stress disorder which appears in 3.5% of the US population. It appears and progresses once the person has survived a horrible incident and was seriously shocked. The causes may be various types of hate crime, violence, abuse, clinical death, etc. Those who suffer from PTSD live in half imaginary world where the worst things seem too real. They have weak nerves, are rather sensitive, and they often challenge numbness.