الفهرس 
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Abstract
Shift work is a method of organizing working time in which workers succeed one another at the workplace so that the establishment can operate longer than the hours of work of individual workers, including working outside daytime working hours such as night shifts, rotational work patterns.
Studies have established that working shifts exposes nurses to occupational risks that can have both short- and long-term negative impacts and numerous studies have found a link between shift work and health issues, in general, staff who work shifts tend to have problems due to de-synchronization of the endogenous physiological system of circadian rhythms, these problems like increasing exhaustion and sleepiness due to insufficient sleep, poor general health, including physiological and psychological health, also increase in gastrointestinal, cardiovascular problems, diabetes, immune suppression, cancers, metabolic diseases like obesity and reproductive functions, job dissatisfaction, accidents and injuries at work, reduced job performance, absenteeism and poor family and social relationships.
Aims of the Study:
To identify the health effects and estimate effect of shift work on co-morbidities on nurses in Assiut University Hospitals, also to determine the shift work associated risk factors predisposing nurses to poor health outcomes and injuries.