My back problems went undiagnosed for a while because the first doctor I went to said my real issue was that I was depressed because I was fat. My BMI was in the low end of the "overweight" category. When I finally found a doctor who would send me to get an MRI (after my back problems got so bad that I ended up on the bathroom floor, screaming in pain and unable to move), they found that I had 3 herniated disks, two digging into my spinal cord.