It is blamed on mental issues because they either don't have adequate testing capacities, or because they don't use all of the available testing capacities. One case in point is disagreement among physicians as to what MRI results show. For many people with MS, optic neuritis is the road to diagnosis, because it's a little easier to pin down. However, in my case, even after I got double vision and a blind spot, it took a year to get anyone to diagnose it. The first neuro I saw said it didn't mean anything (I am not kidding, he was on Maui and he just didn't care about anything, just putting in time). Back in Seattle it still took going to a several doctors to get a label put on my continuing double vision and blind spot. Finally someone did an MRI and some neuro tests related to eyes, all positive.

With the Maui neuro, after he told me it didn't mean anything, I was waiting for my husband to pick me up. I sat in the neuro's office and just screamed. There was another person in the office who didn't look at me or comment. The secretary pretended not to notice. Maybe this happened often. Anyway, screaming was useless.

You see, I'd had many years of going to doctors' offices without diagnoses other than Neuresthenia, which I think means "trouble with nerves". So this was the last straw. The straw that caused the poor old camel to scream--uselessly.