Resources from Archives of General Psychiatry
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It is common knowledge, and probably instinctively understood, that loss of a close attachment ushers in a period of acute grief characterized by intense emotional distress, intrusive thoughts, and withdrawal from ongoing life. Within the framework of these commonalities, no two people grieve in the same way or for the same period of time. Many people experience intense uncontrollable emotions as foreign and the difficulty connecting with others or being interested in usual activities as disconcerting.
Archives of General Psychiatry - Fri, 3 July 2009

http://archpsyc.ama-assn.org/