I am a physician and have seen too many Carpal Tunnel Syndrome in musicians.
CTS happens in the non-musicians anyway but there are certain positions that put you at risk.
The Median Nerve runs through the wrist, under the Flexor Retinaculum. Normally it is fine, but over time, the tunnel gets tighter for a variety of reasons (low thyroid condition, rheumatoid arthristis, pregnancy etc and etc.), thus the name "Carpal Tunnel Syndrome".
The Median Nerve supplies the Flexor Muscles in the forearm and the Thenar muscles, and Sensory for 3.5 digits, counting from the thumb side.
The Ulnar Nerve runs in a "Guyon" Canal...(btw you can Google all these medical terms; too much for me to repeat them here).....Ulnar Nerve entrapment is uncommon.
Yet Median Nerve problem is common even among non-musicians. The problem is that if you have a borderline case of CTS, all you need is playing in an "unnatural" position and the CTS symptoms appear.
Two easy tests for you to do at home are called Tinel's and Phalen's Tests. Google them to find out how you can diagnose the problem yourself.
But seriously get professional physician assessment, don't guess. Also mention to the physician that you play CG.