One of the most common reasons is missing medical evidence. The Social Security Administration needs detailed records that clearly show how your condition prevents you from working.

Another reason claims are denied is incomplete paperwork or missed deadlines. Even small errors can delay or hurt a case. Some applicants are also denied because they continue working above the allowed income limits.

The good news is that a denial does not mean the end of the process. Many people are approved after filing an appeal and providing stronger medical documentation. Working with an experienced disability representative or attorney can also improve your chances of success.