Suicide warning signs or suicidal thoughts include: 
Talking about suicide — for example, making statements such as "I'm going to kill myself," "I wish I were dead" or "I wish I hadn't been born"
Getting the means to take your own life, such as buying a gun or stockpiling pills
Withdrawing from social contact and wanting to be left alone
Having mood swings, such as being emotionally high one day and deeply discouraged the next
Being preoccupied with death, dying or violence
Feeling trapped or hopeless about a situation
Increasing use of alcohol or drugs
Changing normal routine, including eating or sleeping patterns
Doing risky or self-destructive things, such as using drugs or driving recklessly
Giving away belongings or getting affairs in order when there's no other logical explanation for doing this
Saying goodbye to people as if they won't be seen again
Developing personality changes or being severely anxious or agitated, particularly when experiencing some of the warning signs listed above
 Warning signs aren't always obvious, and they may vary from person to person. Some people make their intentions clear, while others keep suicidal thoughts and feelings secret.