If you have a debilitating illness or injury that prevents you from working, then you should submit your application for Social Security Disability (SSD) quickly. No, the program isn't going away or running out of funds. The Social Security Administration (SSA) is notorious for denying applications though. Data released by the federal agency last month shows that many people are dying while waiting to find out if they'll get benefits too.
You put in your application for Social Security Disability benefits. You know that you can't work. You have a note from your doctor that backs up your position. You feel like it's a guarantee that you will get approved.