When it affect you life to the point you are u nable to work to socialize to function yes it is a disability maybe even worse so then diabetes as that disease can be easily regulated with mediction hugs
As TE said, any condition which interferes in one's ability to live a productive and healthy life is a disablity...and yes, depression/anxiety etc. can definitely cause a person to not be able to live and manage the world effectively
"Anne, I don't want to live. . . . Now listen, life is lovely, but I Can't Live It. I can't even explain. I know how silly it sounds . . . but if you knew how it Felt. To be alive, yes, alive, but not be able to live it. Ay that's the rub. I am like a stone that lives . . . locked outside of all that's real. . . . Anne, do you know of such things, can you hear???? I wish, or think I wish, that I were dying of something for then I could be brave, but to be not dying, and yet . . . and yet to [be] behind a wall, watching everyone fit in where I can't, to talk behind a gray foggy wall, to live but to not reach or to reach wrong . . . to do it all wrong . . . believe me, (can you?) . . . what's wrong. I want to belong. I'm like a jew who ends up in the wrong country. I'm not a part. I'm not a member. I'm frozen."
— Anne Sexton (Anne Sexton: A Self-Portrait in Letters)
I gave this quote somewhere else because pretty much summs it up.
Would you consider the incapacity to live a disability? that's the question.
I think depression/anxiety is a disability. I have depression/anxiety, and diabetes (for 11 years), and the depression/anxiety definetly stops me from doing the things I want to do, but not in the same way as diabetes does.
But the difference between them is, you can treat depression/anxiety so you can eventually oversome them. It's not easy, and takes time, but it's possible. But with diabetes, it's always there, and you can't just forget about it. Some situations can cause depression/anxiety, but the diabetes is always there.
I consider it a disability in a way, but I dislike when its medicalized. It's (mental illness in general) not scientifically a literal 'disease' but its just as much or more crippling than many physical problems. Or even vastly more so for some people. I'd take cancer over what I deal with any day, even if I was dealing with it relatively poorly. I think a lot of people think that not medicalizing it doesn't do it justice, but I think of it the opposite way. Medicalizing it results in a shallower distorted understanding of it.