1. Insufficient blood supply. This may be due to excessive use of the arm, which leads to muscle tension in the arm and poor blood flow, thus causing numbness in the hand. In addition, if you keep an uncomfortable posture for too long, it may also lead to numbness in your hands.
2. Cervical diseases. Cervical diseases may compress nerves and cause numbness in the hands. If the posture of practicing health qigong is incorrect, it may increase the pressure on the cervical spine and lead to numbness in the hands.
Please note that the above are only possible reasons, and the specific reasons need to be diagnosed according to personal circumstances. If hand numbness persists or worsens, it is recommended to consult a doctor for further examination and diagnosis.