In order to be found disabled according to SSA:
You cannot be engaging in substantial gainful activity (SGA) which means you cannot be working and earning over the allowable limit SSA has set for the year; and
You must have a severe impairment or health condition whether physical and/or mental; and
Your health condition(s) meets or “equals” one of the conditions described in the Social Security regulations called the “Listing of Impairments; or
You are unable to do your “past relevant work” (PRW), taking your “residual functional capacity (RFC) into consideration; and
No other work exists in the national economy in significant numbers considering your RFC, age, education and work experience.