Not only death of a loved one brings about grief, any loss can jump start grief: divorce, relationship loss, something that was expected didn't happen, aging, etc.
It is a very personal experience. Grief isn't just in your head it shows up in your body, sometimes in unexpected ways. Pleasurable things are not longer pleasurable, food is tasteless, difficulty sleeping, body aches, is like your body is asking you to address the loss.
Avoiding the natural emotional responses after a loss could bring about future problems, like: weaken immune system, depression, headaches, gastrointestinal issues.
Please take time to mourn as you need to. There are healthy ways to grieve.
― Jamie Anderson
Biochemically, tears are naturally healthy and healing on the physical level
3 types of tears
*Basal tears: the regular moist in your eyes
*Reflex tears: these tears happen when there is an irritant, like cutting onion
*Emotional tears: These tears contain a protein-based stress hormone: leucine-enkephalin, that is related to endorphins and is a natural pain killer.
From Therapy in a Nutshell
When grief is processed, acknowledged and accommodated, the brain can gradually make space for the new reality and grief can become less intense or rather our ability to move forward grows. Grief is not easy, and not something that can be fixed, but, there are things that you can do to help your body through the suffering, things like: exercise, making sleep a priority, good nutrition, good connections (social contact), and continue any pleasurable activities even if they don't feel good right away, over time you will be able to enjoy them again. -- Dr. Hollinger