http://www.ssa.gov/redbook/eng/definedisability.htm Visit the Social Security Administration SSA’s definition of disability http://www.ssa.gov/redbook/eng/definedisability.htm#a0=0 http://www.ssa.gov/redbook/eng/definedisability.htm#a0=1 http://www.ssa.gov/redbook/eng/definedisability.htm http://www.ssa.gov/redbook/eng/definedisability.htm#a0=1 SSA’s definition of disability how Social Security defines “disability” in the Red Book http://www.ssa.gov/redbook/eng/definedisability.htm ssa.gov inability to work ssa.gov