Medical Exam Requirements:
Before you can become a California CDL driver, you have to be certified medically fit by a medical exam. Your doctor, physician's assistant, or nurse practitioner must sign the medical form. Take the form to the CA DMV when you apply for a CDL.
The medical conditions that may prohibit you from driving a commercial vehicle include anything that could impair your ability to drive safely, such as:
Be aware this isn't an all-encompassing list; there may be additional disorders which will prevent you from getting a commercial license.