That's not a simple question, and it cannot be answered simply by reading this brief response.
The Social Security Administration follows a 5-step process to decide whether or not an individual is disabled. Remember that the Administration has the authority to ascertain your inability to function for the purposes of obtaining disability benefits. People sometimes feel that only because their doctor decided that they are unable to function proves that they are disabled.
The Social Security Administration has its own definition, it's a legal definition and not a medical one, of disability:
An individual is deemed disabled if he or she is unable to participate in significant gainful activity due to any medically determinable physical or mental impairment(s) that can be expected to result in death or that has lasted or can be expected to last for a continuous period of no less than 12 months.
Consequently, if you can apply these 5 measures to your own mental or physical conditions, you could be effective in deciding whether or not you are disabled:
Are you still employed?
Your application would be rejected automatically if you are already employed and engaged in “substantial gainful activity,” as described by the Social Security Administration. This, like others, can get complicated, but if you make more than $1310 a month, in 2021, and aren't blind, you're doing something worthwhile.
You should proceed to Phase 2 if you are not engaging in substantial gainful work.
Is your disease (or a combination of conditions) severe?
Step 2 requires that the illness last for at least 12 months or be intended to last for at least 12 months and that it interferes with a person's ability to participate in simple physical and/or mental work activities. To summarize, if the illness impacts you emotionally or physically to the point that it interferes with your ability to function, you will be able to skip Step 2 and continue to Step 3.
Does your condition fall into one of the categories?
If the illness is severe enough to satisfy the Social Security Administration's definition of disability, you will be determined if your impairment meets the severity criteria (Step 2) and you are not engaged in significant gainful work (Step 1). If this is not the case, proceed to Phase 4.
Will you do any of the jobs you've done in the last 15 years?
And if you meet the severity criteria, you are still not disabled if you can do any job you have done in the last 15 years and have worked long enough to have mastered the job. If you are unable to perform any of your previous related jobs due to a physical or mental disability, the assessment will progress to Phase 5.
Is there anything else you can do?
If you can perform some form of a job by taking into account your age, experience, and previous related work skills, you are not disabled. If however, you are unable to perform any other type of job due to your mental or physical condition(s), and you meet the other criteria, you may have a good argument for being disabled.