I would go with high blood pressure(it's a gamble but its been documented) as an impairment but still seek depression as an impairment. If you have another impairment,having blood clots, might make it a slam dunk even though it may not be listed its still possible to be disabled with a combination of impairments. Has he ever had heart problems? That would help being disabled with high b/p. Do a google search on SSDI -high blood pressure. Having time on your hands to win your case is a good thing because they might rush to a decision and it might be denied. I have high blood pressure and its mentioned in my award letter. I get tired after walking for 10 minutes and must sit down. What kind of job did he have and how old is he? These are major factors in being awarded SSDI. Bottom line-he must prove that he is unable to work. Standing job-must be able to stand for 6 out of 8 hrs. Sitting job-must be able to sit for 6 out of 8 hrs.