Stress is a psychological process initiated by events that threaten, harm or challenge an organism or that exceed available coping resources and it is characterized by psychological responses that are directed towards adaptation. PNI research suggests that chronic stress can lead to or exacerbate mood disorders such as depression and anxiety, bipolar disorder, cognitive (thinking) problems, personality changes, and problem behaviors. In survival mode, the optimal amounts of cortisol can be lifesaving. But, chronic elevated levels can lead to serious issues. Yoga is a group of physical, mental, and spiritual practices or disciplines which originated in ancient India. Among the well-known types of yoga are Asthang yoga and Hath yoga. Moving yourself into a healthy parasympathetic state, and staying there as much of the time as possible, helps heal all health conditions, both physical and emotional ones as well. The parasympathetic system returns the body's physiological conditions to normal (homeostasis). Vagus Nerve Stimulation normalizes an elevated HPA axis (Selfhacked, 2015).