How does mental illness interfere with functioning on the job?

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Mental illnesses may interfere with functioning in different ways. Many of the illnesses affect a person’s ability to do certain things, such as thinking or communicating with others. Often, the person themselves or the professionals working with them can describe the functional limitations that are specific to your employee. Please remember that since there are a lot of different types of mental illnesses, that this is not a complete list, nor do these limitations apply to everyone who has a mental illness.

Functional limitations due to psychiatric disability

The following is a list* of some of the activities that people with psychiatric disabilities may have trouble doing:
*Adapted from Mancuso, L.L. (1990) Reasonable accommodations for workers with psychiatric disabilities. Psychosocial Rehabilitation Journal, 14(2), 3-19.

Please be aware that any strategies that are considered should be discussed with the employee in advance, identifying the particular areas of difficulty for that person and possible solutions that may work for him or her.

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Why I need to know about functional limitations

The ADA states that employers only need to provide accommodations to the known mental or physical limitations of someone with a disability that can be attributed to that disability. Employers are not required to accommodate limitations due to other characteristics, such as poor literacy skills (that are not due to learning disabilities), low educational levels or lack of credentials. You can ask the employee or a professional to document the types of functional limitations due to the disability that lead to the need for accommodations for that person.

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How I might recognize signs of mental illness in the workplace*

While a single symptom or isolated event is rarely a sign of mental illness, a symptom that occurs frequently, lasts for several weeks, or becomes a general pattern of an individual’s behavior may indicate the onset of a more serious mental health problem that requires treatment. Some of the most significant indications of a possible mental illness include:

In reality, these symptoms are not always readily apparent. Employers and supervisors may be able to notice significant changes in their employees’ work habits, behaviors, performance, and attendance, such as:

People who experience problems such as those listed above may simply be having a bad day or week, or may be working through a difficult time in their lives. A pattern that continues for a long period may, however, indicate an underlying mental health problem.

*Source: Zuckerman, D., Debenham, K. & Moore, K. (1993) The ADA and People with Mental Illness: A Resource Manual for Employers. Available from the National Mental Health Association, 1021 Prince Street, Alexandria, VA 22314-2971

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Some research findings on types of functional limitations

One study recently conducted by the Center for Psychiatric Rehabilitation on Reasonable Workplace Accommodations for People with Psychiatric Disabilities found that the most common functional limitations for employees who were involved with a supported employment service involved:

These functional limitations were accommodated in a variety of ways. Supported employment service providers were often very helpful to employers in identifying the limitations and suggesting effective accommodations.

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The facts on this website are believed to be correct at the time of publication but cannot be guaranteed.
© 1997, Center for Psychiatric Rehabilitation, Boston University