When a person commits suicide, what is the proximate cause of death, the instrument, the person, or God who made the person mortal?
Interesting question Fisherman.
It seems the underlying causes of suicide are either mental health issues or terminal (physical) illness.
According to researchers, suicide in most cases involves an underlying mental health condition.
For example, researchers have found that if someone close to an adolescent dies by suicide, the adolescent’s mental health history is a bigger predictor of future suicidal behavior than his or her relationship to the suicide victim:
http://www.jaacap.com/article/S0890-8567(09)60217-3/abstract
Mental health issues usually arise from a chemical imbalance in the brain.
Some choose doctor assisted suicide to end their lives when they are terminally ill:
There is also the ongoing debate whether the mentally ill should also be allowed the option of doctor assisted suicide:
http://www.msn.com/en-ca/health/medical/my-life-is-a-nightmare-windsor-man-27-wants-legally-assisted-death/ar-AAjH8Oc?li=AAggNb9
I think it is safe to say that the underlying causes of suicide - mental health issues or terminal illness - stem from defects in the human mind and body.