Overall, I think this is a good app, but there are a few things that would make it much more useful for tracking pain. First, it would be nice if you could zoom in on the graph and inputs over the course of a day, such as hour by hour pain scores. I would also like to see the ability to set custom scales (such as anxiety) that can be overlaid onto the same graph as the pain scale. That way it would easy to see how pain changes in relation to another metric that has variable level inputs.
dhstud about My Pain Diary: Chronic Pain & Symptom Tracker, v3.5.8