First, let's clarify what Carpal Tunnel Syndrome is:
The carpal tunnel is an opening in the wrist made up of the carpal bones, ligaments, and other fibrous tissues. With Carpal Tunnel Syndrome, the median nerve and tendons traveling through this passageway become compressed when the carpal tunnel is swollen or restricted. This compression causes numbness and tingling of the wrists, hands, and fingers.
More commonly though, the impingement of the thoracic outlet (the opening between your collarbone and upper ribs where the nerves and blood vessels pass through to supply the arms and hands) is actually the root of all these symptoms. When the muscles (i.e. the scalenes) around this opening become tight and shortened, they pull the first rib up against the collarbone, restricting blood, lymph, and nerve supply to the arms, which ultimately causes all the same symptoms as carpal tunnel syndrome. (The pectoralis minor, triceps, brachialis, and some of the forearm muscles can also become tight and impinge nerves of the arms and hands.)
I also use contrast bathes frequently for my forearms and hands. Ice water submersion for 1-2 minutes, then hot water for the same - just go back and forth about 3 to 5 times, always ending with the ice water! This basically creates a forced circulation, pushing blood out with the ice water then opening up the blood vessels and tissue to new oxygenated blood with the hot. It works wonders.
If your symptoms seem to be stemming from further up the arm - maybe even into the shoulder and neck - your scalenes (anterior, medial, and posterior) and pectoralis minor are most likely the main culprits.
Check out my previous post - Shoulder Pain - for stretches and exercises to alleviate tightness and pain in the shoulders and neck.
On a semi-side note, POSTURE is everything! Check in with your posture throughout the day; you'll probably be amazed by how curved forward and curled up you can get while engrossing yourself in work (or a Netflix binge). Sit up straight, lift the crown of your head to the ceiling, and let those shoulders fall back. This might seem easier said than done, but with massage, self care, and stretching, you can absolutely work your way to less pain with better posture.
And I'll leave you with this. :)