Psychological distress is viewed as an emotional condition that involves negative views of the self, others and the environment and is characterized by unpleasant subjective states such as feeling tense, worried, worthless and irritable [3]. These subjective states can reduce the emotional resilience of individuals and impact on their ability to enjoy life and to cope with pain, disappointment and sadness. Psychological distress can be viewed as a continuum in which people can move from experiencing wellbeing to distress and back at various times throughout their lives [4,5]. The following are the medical and cognitive theoretical perspectives of psychological distress. Medical model Pathology is a prevalent perspective of medical model [5,6]. In accordance to medical model psychological distress is considered as an illness in the same classification as whatever other physical sickness, this model uses comparable model in characterizing psychological distress as that utilized by restorative professionals. As such, psychological distress is some type of neurological imperfection in charge of the scattered thinking and conduct, and requires medicinal treatment and consideration [7]. Cognitive theory Cognitive model define psychological distress as the process of negative thinking and perception [8]. This process is reflected in the case distressed patients have in general a negative vision on themselves, their environment and in the future [9]. They consider themselves as nothing valuable, inappropriate and inadequate. Malnutrition Malnutrition has been perceived as a nationwide trouble [10]. Malnutrition is often not identified in hospitalized patients and can unfortunately lead to increased risk for complications such as morbidity, increased length of stay, increased mortality, functional impairment, and economic implications [11-13]. Research survey carried by Norman et al. [14] expressed that malnutrition linked to the predictive entailments of illness. A growing body investigations explored that no changing were found in the prevalence of malnutrition from 1990, in U.S. and the Europe researchers conclude that in hospitals the ratio of malnourished or at nutritional risk about 31%. Morbidity of malnutrition increasing due to some causes in which marred immune functioning and delayed healing of wounds are most common [14]. Only one study have done with In a study conducted by Ma, Poulin, Feldstain & Chasen [15], the researchers found that there is a positive relationship between malnutrition and psychological distress, and malnutrition as a predictor of psychological distress.