I am horrible at explaining how I feel about things, but I'll give it a shot (I apologize in advance if it doesn't seem clear):
I don't see being trans* necessarily as a medical condition. I am a "Sikh-leaning" person, and I believe in reincarnation and that our souls are genderless. I believe that each life cycle is meant to teach us lessons. So, when I think of me, I don't always think of myself as I am in this present life. I know that in a past life I was a human male, so I think I was put in a female body this time because there was something that I needed to learn about females, or LGBT people that I just didn't get in my past lives.
I think on the gender spectrum, my soul tends to be more on the "male" side of things. Since my soul makes up my core being, I think that is why I sometimes act, speak, and feel what's more typically associated as male. I do have a few female friends, but the bulk of my friends have always been male, I've always been more at ease with men and they are who I've always been easily able to connect with because my core being (or identity) veers more on the male side of things.
I think trans* can be a medical condition because studies have shown that the brains of MTFs (after autopsy) tend to match the brains of biological females, and vice versa. So having something different on a physical scale would account for people having dysphoria. If I wasn't trans, I would just be a more "manly" female who was comfortable in my body-so there must be something different about my brain which explains why I think these things on my chest don't belong and why I need a big grizzly beard.
I just don't like how it's called a "medical condition" because that makes me think of something negative. I just can't equate being trans with having cancer, diabetes, or cerebral palsy, even though it's a lifelong struggle. Being trans isn't going to make me die, be sick, or disabled. But, that's just the limits of our language, physical "abnormalities" are medical conditions or defects-- there are other cultures with multiple gender categories, and I think that's more appropriate because I don't see having a trans brain as being abnormal or unnatural.
Like previous posters, I do find medical condition labeling to be a bit troubling, because I wouldn't want people to be denied access to hormones and surgery if they fail any test that is ever made to determine if people have a physical "abnormality" which makes them trans.