Neurogenic thoracic outlet syndrome is pretty difficult to diagnose if you don’t clearly have an extra rib. I have it, and it comes on when my neck muscles are

Neurogenic thoracic outlet syndrome is pretty difficult to diagnose if you don’t clearly have an extra rib. I have it, and it comes on when my neck muscles are tight - my scalenes are unfortunately just structured such that they “scissor” my brachial plexus. I have exercises and stretches that help, and in times of excess stress a good massage goes a long way. A friend had the vascular form and ended up with a blood clot in his arm as the first symptom, which was fortunately picked up at the ER just before it developed into a pulmonary embolism - he was lucky to be in the hospital already when the PE developed. He was on blood thinners for months and still hasn’t regained totally normal function in his arm due to reduced blood flow.