A depressed friend who talks about "ending it all" isn't being secretive about the desire to commit suicide. However, would you recognize more subtle signs of suicidal risk in a friend who isn't as open about thoughts and feelings or who feels it's a sign of weakness to ask for help? Untreated depression is the most common cause of suicide, so the more you know about it, the easier it is to spot. You don't have to be a mental health professional to notice signs of depression. Recognizing the signs of depression can guide you whether to ask a friend if he or she is feeling suicidal. (Don't shy away from this question. It's the #1 rule in helping prevent suicide.) In today's information age, it's easy to find this information. You'll see there are many signs -- not only deep sadness, but also changes in eating, sleeping, or working habits, severe weight loss or gain, changes in mood or self-image, or recurring talk about guilt or other negative feelings and thoughts. Having a greater knowledge of depression symptoms will help you gauge your concern so you can urge your friend to consult with a medical doctor, mental health professional, or the EAP.