Grief is the reminder that you loved and have lost and it is entirely human. Grief is the pain in your gut when you remember a lost friend, family member, pet, time, or opportunity that has been lost to you. It often occurs after a death, but death is not the only cause for grief. A falling out with a dear friend that results in that friendship ending can cause grief. Moving out of your childhood home and recognizing that your childhood and the warmth, safety, and freedom that came with it are gone forever can cause grief. Looking back on a chance you did not take but now wish you had can cause grief. However, typically the most powerful grief comes from the death of or separation from someone deeply loved. Grief does not fade away or disappear, it only shrinks and you grow around it.
However, if you find that the loss you feel is growing stronger or not losing some of its sharpness, you may need to speak with a grief counselor or with others who experience grief similar to your own. Grief does not go away by being kept inside. If you are struggling to cope with grief of any kind, or someone you know is having trouble pulling themselves out of the pit of loss, consider the resources below.
Healing Your Grieving Heart for Teens by 
