Fear is the major cause of post traumatic stress disorder .                 

post traumatic stress disorder , once called shell shock or battle fatigue syndrome ,is a serious condition that can develop after a person has experienced or witnessed a traumatic or terrfying event in which serious physical harm occured was threatened . ptsd is a lasting consequence  of traumatic ordeals that cause intense fear , helplessness, horror, such as a sexsual or physical assault, the unexpected death of a loved one , an accident , war, or natural disaster.

most people who experiences a traumatic event will have reactions that may include shock , anger, nervousness fear, and even guilt . people with ptsd have symptoms for longer than one month and cannot function as well as before the event occured.

who gets ptsd ?

everyone reacts to traumatic events differently .

each person is unique in his or her ability to manage fear and stress and to cope with the  threat posed by a traumatic event or stituation for that reason , not everyone who experiences or or witnesses a trauma will develop PTSD.  PTSD was first brought to the attention of the medical community by war veterans  ; hence the names shell shock and battle fatigue syndrome .

however , ptsd can occur in anyone who has experienced a traumatic event that bthreatens death or violence. people who have been abused as children or whohave been repeatedly exposed to life - threatening situations are at greater risk for developing ptsd. victims of trauma related to physical and sexsual assault face the greatest risk for PTSD.

citation ://www.webmd.com