Stress related to our mental well-being, including that associated with depression, anxiety, and PTSD, is difficult to measure in practice. Levels of cortisol, a steroid hormone, are closely linked to changes in one’s mental state and blood tests are available to measure cortisol. But a blood test can raise a person’s stress level itself and … Continue reading First Noninvasive Cortisol Detector to Monitor Stress, Mental Conditions