Multifactorial experience of pain

Pain is defined in many ways: "An unpleasant aesthetic and emotional experience associated with actual or potential tissue damage or described in terms of such damage. Pain is a category of complex experiences, as it is not a single sensation produced by a single stimulus".
"Pain is what a person experiences and takes place when he says it is happening".
Paroxysmal pain is pain of moderate or severe intensity and occurs in the background of chronic controlled pain. Paroxysmal pain can be described as automatic, unexpected, or predictable and predictable.
Psychological discomfort has been defined as a multifactorial unpleasant emotional experience in terms of the psychological sphere (cognitive, behavioral, emotional), social and spiritual and can affect the effective treatment of cancer, such as physical symptoms and treatment. Discomfort can range from vulnerability, sadness and phobia to depression, anxiety, and an existential and spiritual crisis.