Exam stress can also cause some physiological changes. Studies on the effect of episodic stress such as final examinations on lipid concentration have been reviewed. Some of those have shown increase and others detected decrease of blood lipids and lipoproteins. Various studies have been conducted to examine lipids and lipoproteins under different stressors. The activation of the SNS results in non specific physiological changes including release of catecholamines which increases heart rate, blood pressure and cardiac volume. The stress response consists of activation of sympathetic nervous system (SNS) and hypothalamo-pituitary-adrenal (HPA) axis. Cytokines and cortisol seem to play an important role in the communication of these systems. These include psychological disorders such as depression and anxiety and medical disorders, including coronary heart diseases, hypertension and diabetes Physiological studies have shown that stress from any source can influence the endocrine, hemopoietic and immune system. Stress is one of the main reasons for the development of various pathological conditions.
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