Post-traumatic stress disorder is an condition that you might get after a serious and frightening experience, including:

• a natural disaster like an earthquake or flood,
• war,
• terrorist attacks,
• serious accidents,
• seeing someone die, or
• violence against you.

The condition makes you re-live the event, which causes distress and difficulty in your day-to-day life. Your symptoms may become worse if you see, hear or smell something that reminds you of the trauma. Some people refer to this as a "flashback". To learn more, click this link.