Boredom boreout syndrome is a psychological disorder that causes physical illness mainly cause by mental underload at the workplace due to lack of either adequate quantitative or qualitative workload. One reason for bore-out could be that the initial job description does not match the actual work. 
This theory was first expounded in 2007 in Diagnose Boreout, a book by Peter Werder and Philippe Rothlin, two Swiss business consultants. 
Symptoms of the bore-out syndrome are described by the Frankfurt psychotherapist Wolfgang Merkle as similar to the burnout syndrome. These include depression, drive and insomnia, but also tinnitus, susceptibility to infection, stomach upset, headache and dizziness.   
The consequences of boreout for employees are numerous both psychologically and physically and more or less serious. On the psychological level, boredom, dissatisfaction, and permanent frustration gradually lead the victim of a boreout into a vicious circle. They gradually lose the will to act at the professional level and at the personal level. To the loss of self-esteem is added the constant anxiety of being discovered. The boreout victim lives with the constant fear that their supervisor, colleagues, or friends will discover their inactivity and duplicity.The confrontation with and enduring the unsatisfactory situation leads to further stress that paralyzes and strains.  Being constantly confronted with the emptiness of their professional life and their uselessness in society, the employee is in great pain. The suffering all the more accentuated because it cannot be shared and if it is, is not understood.This is also the reason that this syndrom is relatively unknown:
This has to do with the fact that everyone prefers to have disorders that are socially considered. Someone who says, 'I have so much to do, my God, the job is banging up at work', is much more respected than someone who says he's bored, has no responsibilities, and that's what gets him done. Everyone says: 'I want to trade with you, that's great!
(Das hat damit zu tun, dass jeder lieber Störungen hat, die sozial angesehen sind. Jemand, der erzählt: ‚Ich habe so viel zu tun, mein Gott, mir kracht die Bude zusammen vor Arbeit‘, ist sehr viel angesehener als jemand, der sagt, er langweilt sich, hat keine Aufgaben, und das macht ihn fertig. Da sagt doch jeder: ‚Mit dir möchte ich tauschen, das ist ja super!)
– Interview: Wolfgang Merkle Frankfurter Allgemeinen Zeitung, 2010 
This can lead to serious mental disorders such as personality destruction or even depression or suicide. Boreout is also a trigger for physical diseases such as certain types of epilepsy caused by stress or exhaustion, severe sleep disorders, hand and voice tremors, shingles, and ulcers.
On the physical side, according to the British "Bored to death" study, employees who are bored at work are two to three times more likely to be victims of cardiovascular events than those whose employment is stimulating. The permanent anxiety in which the employee lives exhausts him physically. Fatigue is constant despite physical inactivity. Boreout can lead to eating disorders such as untimely nibbling or loss of appetite. Some people may use alcohol or drugs to overcome their discomfort and thus develop a harmful addiction.
According to Peter Werder and Philippe Rothlin, the absence of meaningful tasks, rather than the presence of stress, is many workers' chief problem. Boreout consists of three elements: boredom, lack of challenge, and lack of interest. These authors disagree with the common perceptions that a demotivated employee is lazy; instead, they claim that the employee has lost interest in work tasks. Those suffering from boreout are "dissatisfied with their professional situation" in that they are frustrated at being prevented, by institutional mechanisms or obstacles as opposed to by their own lack of aptitude, from fulfilling their potential (as by using their skills, knowledge, and abilities to contribute to their company's development) and/or from receiving official recognition for their efforts.
The authors suggest that the reason for researchers' and employers' overlooking the magnitude of boreout-related problems is that they are underreported because revealing them exposes a worker to the risk of social stigma and adverse economic effects. (By the same token, many managers and co-workers consider an employee's level of workplace stress to be indicative of that employee's status in the workplace.)
There are several reasons boreout might occur. The authors note that boreout is unlikely to occur in many non-office jobs where the employee must focus on finishing a specific task (e.g., a surgeon) or helping people in need (e.g., a childcare worker or nanny). In terms of group processes, it may well be that the boss or certain forceful or ambitious individuals with the team take all the interesting work leaving only a little of the most boring tasks for the others. Alternatively, the structure of the organization may simply promote this inefficiency. Of course, few if any employees (even among those who would prefer to leave) want to be fired or laid off, so the vast majority are unwilling and unlikely to call attention to the dispensable nature of their role.
As such, even if an employee has very little work to do or would only expect to be given qualitative inadequate work, s/he gives the appearance of "looking busy" (e.g., ensuring that a work-related document is open on one's computer, covering one's desk with file folders, and carrying briefcases (whether empty or loaded) from work to one's home and vice versa).
The symptoms of boreout lead employees to adopt coping or work-avoidance strategies that create the appearance that they are already under stress, suggesting to management both that they are heavily "in demand" as workers and that they should not be given additional work: "The boreout sufferer's aim is to look busy, to not be given any new work by the boss and, certainly, not to lose the job."
Boreout strategies include:
Consequences of boreout for employees include dissatisfaction, fatigue as well as ennui and low self-esteem. The paradox of boreout is that despite hating the situation, employees feel unable to ask for more challenging tasks, to raise the situation with superiors or even look for a new job. The authors do however propose a solution: first, one must analyse one's personal job situation, then look for a solution within the company and finally if that does not help, look for a new job. If all else fails, turning to friends, family, or other co-workers for support can be extremely beneficial until any of the previously listed options become viable.
According to Prammer, boreout can also have a variety of effects on businesses: