The left thumb is numb because six joints of your cervical vertebra dislocate to the left and squeeze the nerve. The reason is that your bad habit of tilting your head to the left leads to dislocation of the cervical vertebra. Reductive therapy is simple. 1, you can press the right middle cervical vertebra 6 in the left shoulder fossa of the cervical vertebra with the index finger, middle finger and ring finger of your right hand at the same time, then slowly find the painful position, and then push the cervical vertebra 6 to the right with a maximum force of 5 kg. It lasted until the cervical vertebra stopped hurting, and the hand was not numb at once. 2. You can also do this: at your door (where the lock tongue appears on the door), put the pain point of the left cervical vertebra (6 joints between the cervical vertebra and the shoulder) against the door, bend with the left leg and kick with the right leg, so that the left arm naturally droops, and the right hand leans against the door frame to grasp the direction, and the cervical vertebra pushes the door.

Slowly apply strength to the whole body. Remember: strength is pushed from the left to the right shoulder. If your left hand feels numb and your arm doesn't hurt, don't push again. Steady.

It only takes a minute. These are two ways to treat hand and arm pain and numbness through self-reduction. If you master it well, it can be cured in a few minutes.