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According to Lowe and Bennett (2003), post-traumatic stress disorder is an acute anxiety disorder caused by witnessing distressful events such as terrorist attacks, tragic road accidents, rape and violent death. The affected may experience flashbacks and nightmares as ways of relieving himself or herself from the stress. He or she often suffers from isolation, inability to fall asleep and always get easily irritated. Other health problems that stem from stress include heart disease, asthma and diabetes.
A study conducted by Bickerstaff (2007) found out that those who have stress are more vulnerable to heart problems and high blood pressure. He argues that
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