Mental health issues are difficult to cope with, and when one causes you to have to stop working, you may be wondering about Social Security Disability or SSDI. Mental health conditions do qualify for SSDI, but you have to qualify under the SSA's definition of disability. The National Alliance on Mental Illness reports that about 35.2 percent of all SSDI recipients receive it because of a mental health condition. SSDI requires not only a disability but also a past work requirement to qualify. Another type of assistance is called SSI, which is based on disability and financial need.