In Yogic philosophy, it is said that a clairvoyant sage can look into this spot and count the number of breaths and heartbeats a person will take in life. In conventional medical circles, people suffering from stress are generally diagnosed with chronic fatigue syndrome though some are given more erudite sounding pronouncements that appear to refer to viruses, like Epstein-Barr Syndrome or Cytomegalovirus. Some are told that they are allergic or environmentally sensitive. Symptoms range from simple exhaustion to much more complex problems that are secondary to excessive output of adrenal hormones, hormones that flood the bloodstream in vastly increased quantities whenever there is any stress. Stress can be emotional, such as insecurity due to lack of parental understanding and support, fear that a vital relationship is unstable because of a partner's illness or infidelity, worry over one's own health and viability, or concern for the well-being of those dear to oneself.
Stress can also be quite difficult to pinpoint.
Living with an alcoholic or a person who gambles is usually acknowledged as stressful, but living with someone one instinctively dislikes or mistrusts is harder to recognize as a stressor. Likewise, there are pathogenic factors that one may or may have identified. These can be as subtle, but real, such as anxiety over global politics and the manner in which people in high positions exercise their power to as unrecognized as proximity to ley lines, outgassing of building materials, electrical frequencies, and astrophysical force fields. The truth is that we all live in a sea of vibrations, some of which are congenial and some that are not. Whether or not we are able to identify the factors contributing to energy depletion, our subconscious natures hold extremely strong opinions about everything that impinges on existence.