Hello @GricelValdes MS hug gets its name from certain sensations felt during an episode of muscle contractions. Some people report no pain, but a sense of tight pressure around the waist, torso, or neck. Others may experience a band of tingling or burning in the same area. Sharp, stabbing pain or dull, widespread aching are also possible symptoms of MS hug. Words often used to describe MS hug include:

squeezing
crushing
ants crawling under the skin
hot or cold burning
pins and needles
As with other symptoms of MS, girdling is unpredictable and does not present the same way in everyone who experiences it.

Although MS hug is the result of a muscle spasm, the pain you feel is neurologic in nature. In other words, it’s nerve pain, which can be difficult to resolve. Over-the-counter pain relievers such as ibuprofen and acetaminophen are unlikely to bring the same kind of relief to burning pain as it does for a headache. Anti-spasticity muscle relaxant drugs such as baclofen and diazepam, however, are effective for easing muscle spasms and tightness in many people. Your doctor might also prescribe medications such as gabapentin and pregabalin designed to alleviate nerve pain. Research treatment options for the MS Hug to find one most effective for you.

Oh the MS Vice, constrictor, crush...hug seems such an inappropriate name which males it sound all warm and fuzzy. It is when the intercostal muscles between your ribs spasm (my understanding) which is why you can get that constricting sensation around the torso. Mine have all been unexpected and felt like bad indigestion moments before excruciating breath squeezed out of me pain. There was no trigger as far as I know and I didn't know I had MS let alone to check if I did. It was hard not to panic but that only seems to make them worse.
I find now if I feel it starting - these days only seem to get back, back of neck to throat - I just relax and breathe normally because these too do pass.

When I take a shower in the morning, the cold water initially will instigate the hug. With me it just happens, it's not related to an attack!

just a tightness/squeezing sensation around my lower chest and abdomen. I get the "MS hug" off and on and even in a day it can come and go.

https://youtu.be/9EJU3RC3SNc
Here is a link I found for an ms hug, hope it's helpful!