Most people who are exposed to a traumatic event experience some of the symptoms of PTSD. However in most cases the symptoms disappear in the days and the weeks following exposure.

Symptoms of PTSD can include: 

• flashbacks, nightmares or frightening thoughts, especially when exposed to anything reminiscent of the traumatic event,
• sweating and shaking,
• avoidance of reminders of the event and a refusal to discuss the experience,
• numbness and feelings of estrangement or detachment from others,
• inability to remember aspects of the traumatic event,
• decreased interest in life,
• increased consciousness of one's own mortality,
• flight/fight syndrome,
• problems with concentration,
• problems with sleeping,
• irritability or outbursts of anger,
• hyper-vigilance and alertness to possible danger,
• re-experiencing the traumatic event,
• feelings of guilt,
• long-term behavioural effects,
• alcohol abuse,
• drug dependency,
• failed relationships/divorce,
• severe depression, anxiety disorders or phobias,
• chronic illness headaches, stomach upsets, dizziness, chest pain and general aches and pains, together with a weakened immune system, and
• employment problems.

PTSD often involves periods of symptom remission followed by an increase of symptoms. However, some people will experience severe and unremitting symptoms.