Re: Plantar fasciitis?
Plantar fasciitis is really common, so a lot of doctors diagnose it just based on a description of the symptoms. It can also be diagnosed by sensitivity over the arch, lack of an arch, pain when standing after rest, heel pain, cramping in the arch, etc. Description of the symptoms is the best way for them to diagnose it, as there may not actually be a measurable problem. MRIs could show issues with the plantar fascia such as thickening, tears, etc... but usually an MRI isn't necessary.
With that diagnosis, I would first begin conservative treatments. Orthotics, stretching, physical therapy, deep tissue foot massages, night splints, etc. Some doctors even suggest a walking boot first to relieve the initial pain. I had a cortizone shot when I was 13 because I was an athlete and couldn't take time off, and it helped for a short amount of time, but I wouldnt recommend doing it. First off it would only mask the pain which would likely cause it to get worse, and secondly, cortizone shots for PF can make you more prone to tearing your posterior tibial tendon.
Depending on how bad it is, you can find a lot of information on these boards and the internet for treatments you can do on your own that should help some. If those don't work, I would see another doctor. I wouldn't jump right to injections as a first treatment option.