My mother was sitting and suddenly her thumb started curling towards her palm in front of my eyes, she was not able to move it at all, we massaged at and relaxed it to the original position, we were just talking about it but the same thing happened again. She explained at a numbing feeling starting from her wrist upto the tip of her fingers and some kind of sensations near the mase of the thumb too. My mother is currently getting treatment for her cervical pain (physiotherapy and medications).