Could poor circulation cause carpal tunnel-like signs in the wrist and under the thumb ?

Carpal Tunnel Synd: Having carpal tunnel syndrome can feel like the circulation is being cut off in the hand. Usually this is because the nerve is being compressed by surrounding tissues. See a hand surgeon to have a thorough history and physical. Treatments can vary from nsaids, splinting, steroid injection, to minimally invasive surgery.

Wrist and thumb: Carpal tunnel can cause numbness or pins and needles. Poor circulation can cause very similar symptoms. So the answer is yes.