What are the Warning Signs of Suicide?

Talking about suicide Any talk about suicide, dying, or self-harm, such as “I wish I hadn’t been born,” “If I see you again…” and “I’d be better off dead.”
Seeking out lethal means Seeking access to guns, pills, knives, or other objects that could be used in a suicide attempt.
Preoccupation with death Unusual focus on death, dying, or violence. Writing poems or stories about death.
No hope for the future Feelings of helplessness, hopelessness, and being trapped (“There’s no way out”). Belief that things will never get better or change.
Self-loathing, self-hatred Feelings of worthlessness, guilt, shame, and self-hatred. Feeling like a burden (“Everyone would be better off without me”).
Getting affairs in order Making out a will. Giving away prized possessions. Making arrangements for family members.
Saying goodbye Unusual or unexpected visits or calls to family and friends. Saying goodbye to people as if they won’t be seen again.
Withdrawing from others Withdrawing from friends and family. Increasing social isolation. Desire to be left alone.
Self-destructive behaviour Increased alcohol or drug use, reckless driving, unsafe sex. Taking unnecessary risks as if they have a “death wish.”
Sudden sense of calm A sudden sense of calm and happiness after being extremely depressed can mean that the person has made a decision to commit suicide.

Source: helpguide.org