Neimeyer in 1998, defines that a loss is related to the deprivation of something we have had, the failure to preserve something that has value to us, a decrease in some process and destruction. On the other hand, Bowlby in 1998 inferred that there are biological foundations to face any type of loss, he says that this is not taken into account and that the course of biological development instinctive skills are generated around which a loss can be reversible and can be reversed. recover the relationship with the lost object, what he called the "Theological theory of grief." There are different types of loss such as: material loss, relational loss, intrapersonal loss and evolutionary loss.