A suicide attempt is a clear indication that something is gravely wrong  in a person’s life. No matter the race or age of the person; how rich or  poor they are, it is true that most people who die by suicide have a  mental or emotional disorder. The most common underlying disorder is  depression, 30% to 70% of suicide victims suffer from major depression  or bipolar (manic-depressive) disorder. 
The one question everyone has asked without exception, that they ache to have answered more than any other, is simply, why?
Why  did their friend, child, parent, spouse, or sibling take their own  life? Even when a note explaining the reasons is found, lingering  questions usually remain: yes, they felt enough despair to want to die,  but why did they feel that? A person’s suicide often takes the people it  leaves behind by surprise (only accentuating survivor’s guilt for  failing to see it coming).
People who’ve survived suicide attempts  have reported wanting not so much to die as to stop living, a strange  dichotomy but a valid one nevertheless. If some in-between state  existed, some other alternative to death, I suspect many suicidal people  would take it. For the sake of all those reading this who might have  been left behind by someone’s suicide, I wanted to describe how I was  trained to think about the reasons people kill themselves. They’re not  as intuitive as most think.
In general, people try to kill themselves for six reasons:
1. They’re depressed
   This is without question the most common reason people commit suicide.  Severe depression is always accompanied by a pervasive sense of  suffering as well as the belief that escape from it is hopeless. The  pain of existence often becomes too much for severely depressed people  to bear. The state of depression warps their thinking, allowing ideas  like “Everyone would all be better off without me” to make rational  sense. They shouldn’t be blamed for falling prey to such distorted  thoughts any more than a heart patient should be blamed for experiencing  chest pain: it’s simply the nature of their disease.
Because  depression, as we all know, is almost always treatable, we should all  seek to recognize its presence in our close friends and loved ones.  Often people suffer with it silently, planning suicide without anyone  ever knowing. Despite making both parties uncomfortable, inquiring  directly about suicidal thoughts in my experience almost always yields  an honest response. If you suspect someone might be depressed, don’t  allow your tendency to deny the possibility of suicidal ideation prevent  you from asking about it.
2. They’re psychotic
   Malevolent inner voices often command self-destruction for  unintelligible reasons. Psychosis is much harder to mask than depression  — and arguably even more tragic. The worldwide incidence of  schizophrenia is 1% and often strikes otherwise healthy, high-performing  individuals, whose lives, though manageable with medication, never  fulfill their original promise.
Schizophrenics are just as likely  to talk freely about the voices commanding them to kill themselves as  not, and also, in my experience, give honest answers about thoughts of  suicide when asked directly. Psychosis, too, is treatable, and usually  must be for a schizophrenic to be able to function at all. Untreated or  poorly treated psychosis almost always requires hospital admission to a  locked ward until the voices lose their commanding power.
3. They’re impulsive 
 Often  related to drugs and alcohol, some people become maudlin and  impulsively attempt to end their own lives. Once sobered and calmed,  these people usually feel emphatically ashamed. The remorse is usually  genuine, and whether or not they’ll ever attempt suicide again is  unpredictable. They may try it again the very next time they become  drunk or high, or never again in their lifetime. Hospital admission is  therefore not usually indicated. Substance abuse and the underlying  reasons for it are generally a greater concern in these people and  should be addressed as aggressively as possible.
4. They’re crying out for help, and don’t know how else to get it
   These people don’t usually want to die but do want to alert those  around them that something is seriously wrong. They often don’t believe  they will die, frequently choosing methods they don’t think can kill  them in order to strike out at someone who’s hurt them—but are sometimes  tragically misinformed. The prototypical example of this is a young  teenage girl suffering genuine angst because of a relationship, either  with a friend, boyfriend, or parent who swallows a bottle of Tylenol—not  realizing that in high enough doses Tylenol causes irreversible liver  damage.
I’ve watched more than one teenager die a horrible death  in an ICU days after such an ingestion when remorse has already cured  them of their desire to die and their true goal of alerting those close  to them of their distress has been achieved.
5. They have a philosophical desire to die
   The decision to commit suicide for some is based on a reasoned decision  often motivated by the presence of a painful terminal illness from  which little to no hope of reprieve exists. These people aren’t  depressed, psychotic, maudlin, or crying out for help. They’re trying to  take control of their destiny and alleviate their own suffering, which  usually can only be done in death. They often look at their choice to  commit suicide as a way to shorten a dying that will happen regardless.  In my personal view, if such people are evaluated by a qualified  professional who can reliably exclude the other possibilities for why  suicide is desired, these people should be allowed to die at their own  hands.
6. They’ve made a mistake
  This is a  recent, tragic phenomenon in which typically young people flirt with  oxygen deprivation for the high it brings and simply go too far. The  only defense against this, it seems to me, is education.
The  wounds suicide leaves in the lives of those left behind by it are often  deep and long lasting. The apparent senselessness of suicide often fuels  the most significant pain survivors feel. Thinking we all deal better  with tragedy when we understand its underpinnings, I’ve offered the  preceding paragraphs in hopes that anyone reading this who’s been left  behind by a suicide might be able to more easily find a way to move on,  to relinquish their guilt and anger, and find closure. Despite the  abrupt way you may have been left, those don’t have to be the only two  emotions you’re doomed to feel about the one who left you.