Stress is a complex and multifaceted phenomenon, involving multiple processes placed on different epistemological levels investigated by different disciplines (e.g., physics, biology, medicine, psychology). In turn, stress is influenced by several factors of various nature (e.g., biochemical, genetic, psychosocial) with a transitory (e.g., exam, job interview), chronic (e.g., war, permanent disability), and even dispositional time course (e.g., anxiety disorder). We are used to think about stress as a negative condition leading to even worse somatic and psychological reactions, but is this always true?