Effects of Abuse

Being abused does not necessarily cause psychological or medical
illness to occur. However, being abused does make it much more likely
that one or more psychological or medical illnesses will occur.
Victimized people commonly develop emotional or psychological problems
secondary to their abuse, including anxiety disorders and various forms
of depression. They may develop substance abuse disorders. If abuse has
been very severe, the victim may be traumatized, and may develop a
posttraumatic stress injury such as posttraumatic stress disorder
(PTSD), or acute stress disorder. If abuse has occurred from a very
early age and has been substantial, a personality disorder may occur
(such as borderline, narcissistic, or histrionic personality disorders
or in some cases, a severe dissociative disorder such as dissociative
identity disorder (commonly known as multiple personality disorder).
Sexual disorders may be present. Sex may be experienced as particularly
undesirable, or physically or emotionally painful. Alternatively,
sexual promiscuity may be observed with the increased risk of sexually
transmitted diseases and unwanted pregnancy that such behavior carries.
Severe abuse can even lead the victim to contemplate suicide or carry
out suicidal impulses. Abuse can result in poor self-esteem, which can
lead to a lack of close and trusting relationships or to body image
issues (particularly for sexual abuse victims), which in turn can
result in eating disorders, which can be seen as victims' attempts at
self-control in one small part of life when they otherwise feels
completely out of control and vulnerable.

It is important to note that abuse alone is not sufficient to create
psychological disorders. Abuse can be a very strong factor contributing
to their development, however. Developing a psychological disorder,
such as depression, does not mean that you were necessarily abused, and
being abused does not mean you will develop depression. Abuse is a
sufficient cause for depression; however, there are many other reasons
why someone might become depressed.

Posttrauma Responding
Though it is an oversimplified and perhaps even overreaching suggestion to make, it maybe easiest to think of the cluster of problems that are typically observed in the wake of abuse as all various forms of a sort of posttrauma condition, where the trauma experienced is abuse. Posttrauma conditions such as PTSD occur in the aftermath of a significant trauma (where trauma is defined as exposure to some event that involves the threat or reality of death (either one's own or another's)). Not all abuse situations get this scary, but many are disturbing enough in one fashion or another to make a lasting impact on a person's mind. When posttrauma illnesses occur they are characterized by the presence of three classes of symptoms. First, the posttrauma victims typically experience vivid, unwanted and highly intrusive memories of their traumatic events. Intrusive recollections may occur during waking hours or during sleep (often in the form of vivid and repetitive nightmares re-enacting the trauma). Second, posttrauma victims make efforts to avoid exposing themselves to anything that might remind them of their trauma. Third, posttrauma victims become very anxious and jumpy after their trauma. As should be clear from thoughtful contemplation of these symptoms, PTSD can be a very debilitating condition.
Posttrauma victim's attempts at avoidance of trauma-related things can push them towards impulsive actions that less frantic people would avoid. PTSD victims commonly abuse drugs, for instance, and this drug use is thought to begin as a means of coping with trauma. Similarly, depression and sexual acting out can be thought of as attempts to cope, however, dysfunctionally. Depression functions to blunt emotional responding, and promiscuity to give into it wholly ("if I'm damaged goods I might as well act like it"). Similarly, multiple personality disorder and the other abuse-related personality disorders represent wide-scale alterations of victim's personalities that help them shield themselves from emotional pain.