If you have tried to apply for SSDI, or if you are contemplating applying and have spoken to others about it, then you know it can be a long haul. SSDI does have a fast-track application process for certain illnesses. As of this month, they just added 52 more conditions to that list, which will certainly make things easier for at least some people who already have enough to deal with.
Review the entire list of Compassionate Allowances here.