Numbness and Tingling in my left arm?

Earlier this year my mom had a similar problem. She would feel tingling all the way down her arm. When the injury first occurred, it was excruciating, but over time it became easier to tolerate. She went to the doctor, and he said she had a herniated disc. She went to physical therapy, and her arm greatly improved. She was going to have to undergo surgery, but the doctor said if it was not causing her that much trouble that she should go with out it unless it became a major problem again. She will have permanent weakness in that arm, but surgery would not guarantee to make it 100 percent better. Anyway, what I am saying is that it might have something to do with the discs in your back. Strengthening exercises would help your recovery, and I hope it gets better.