· Talking about suicide or wanting to die
· Looking for ways to die
· Feelings of hopelessness
· Feeling trapped or in unbearable pain
· Talking about being a burden to others
· Increasing use of alcohol or drugs
· Acting anxious or agitated
· Sleeping too little or too much
· Withdrawing or feeling isolated
· Showing rage or an unusual level of calmness
· Extreme mood swings
· Sudden changes in performance at work or school
· Lack of interest in previously enjoyed activities
· Apathy toward the future
· Impulsive or reckless behavior
· Expressions of low self-esteem or self-hate
· Changes in physical appearance
· Giving away important or meaningful possessions
· Pursuit of dangerous objects or supplies
· Saying goodbye
http://www.learnpsychology.org/suicide-depression-student-guidebook/