The SCM muscle is an accessory muscle of inspiration, i.e. it helps holding up the windpipe when you inhale.
I am sorry but this is incorrect. "Accessory" means secondary or backup in this case.
The accessory muscles are not used in normal respiration they are only needed for respiration in certain types of respiratory problems/illness.
OTOH SNIFFING may qualify as a problem that uses this accessory (it surely seems to)
But I HAVE to point out that your body is full of muscles that get heavy use and are very strongly contracted repeatedly...have you seen some weight lifter's necks?
It is compelling to imagine that the SCM is just too tight and the cause of all this, but there are probably other factors.
May-Thurner is a deal where the iliac vein is compressed by the iliac artery in some people this results in deep vein thrombosis in the left leg. BUT there is a congenital issue there first........
maybe this will be true of these lower jug issues. Certainly the early histology is that these veins are different, so it is probably not just the muscles...
I'm not offering medical advice, I am just a patient too! Talk to your doctor about what is best for you...
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