Terms of Use The definition of disability in the Social Security law is a strict one. To be eligible for benefits, a person must be unable to do any kind of substantial gainful work because of a physical or mental impairment (or a combination of impairments), which is expected either: to last at least 12 months, or to end in death If, because of a medical condition, a person cannot do the work that they performed in the past, then age, education, and past work experience must be considered
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