It’s not a proper medical term, is it? Just what MSers themselves tend to call it.
I think, as you say, the correct term would be “spasm of the intercostal muscles”, but that’s a lot more of a mouthful than just “MS Hug”.
I’m pretty sure it wouldn’t be unique to MS (though I don’t know offhand what else might cause it), so it wouldn’t be a specific enough test for MS.
Besides, not everyone gets it, and those that do describe it in widely varying terms, so I don’t think a diagnostic indicator that relies solely on the patient’s subjective description would be very reliable. If it can’t be tested or measured, how do you know the patient is experiencing the “MS hug”, and not, say, angina, or indigestion?
It isn’t technically necessary to have an LP to diagnose MS anyway - I never did. NICE guidelines say it should only be used where other evidence is inconclusive. It’s odd how most neuros still seem to treat it as routine in all cases, and not only where there’s particular difficulty or ambiguity.
True, I had to wait longer to amass enough evidence by other means. Maybe most patients wouldn’t be happy with that? But I preferred a wait to a lumbar puncture, anyway. It was only a six month wait, as it turned out. Which may have seemed like an age at the time, but in the context of a disease I’d probably had for years already, and WILL have all my life, it’s not very long.