(1) The positive meaning of pain. Pain is a signal of human tissue damage, which makes people know that the body is being hurt, so it is a useful warning. This is the biological value of pain, which has protective and positive significance. Without the warning of pain, we can't avoid harmful stimulation, and we can't understand the internal diseases and prevent trauma.
(2) The negative meaning of pain. If the pain is intense and persistent, it will become painful torture, affect work and study, and become a bad stimulus that destroys physical and mental health.