Wow, seems like all my answers to life’s questions lately have been “it depends”. 
Here’s another thing I thing should be left to the discretion of judges, and why it’s important to elect good judges.
A few years ago, I rear-ended a woman, and her car rolled forward and rear-ended another car. We all got out, paramedics came “just in case”, and everyone declared they were fine, no need for medical care, we’re all good here, let’s let the insurance companies sort it all out. A couple of years go by and on the very day before the statute-of-limitations runs out, I get a call from my insurance company that the woman in the front car (the one hit by the person I hit) had filed a lawsuit against me that day.
Arbitration (required in our state) revealed that she’d had documented back pain for more than five years *before *the accident, requiring monthly chiropractic and physical therapy visits. She claimed the accident exacerbated her pain, and she had to quit her job as a nurse because of it - but she didn’t quit the job until more than a year after the accident. She never saw a doctor, nor did she increase her chiropractic or PT visits. She did not ask her hospital for lighter-duty work or administrative work, she just quit because she could no longer lift 300 pound patients. It was obvious to everyone - me, my lawyers, the arbitrator, and even her lawyers, that this woman was an opportunistic bitch. I would honestly not have had a problem had her behavior been in accord with her claims, but it was just too blantant for words.
She lost the suit, as I think is only just.
However, if in a similiar scenario, the claimant had sought medical care, had worked to find employment she could do, had increased doctor or PT visits and documented and increase in pain, I would say she’d probably be credible, and should be compensated for her loss of income and increase in medical fees, even if there was no way to show soft tissue pain on a medical test.
But it should also be noted that just because pain doesn’t show up on a test, that doesn’t mean a doctor can’t often tell when you’re faking. There are signs - blood pressure, heart rate, breathing rate - that *can *be measured, and others - sweeping hand gestures rather than specific pointing to indicate “where it hurts” - that doctors recognize as indicators that a patient is not being truthful.