Paralysis is caused by a malfunction of the nervous system. Nerves that are not harmed provide signals to muscles. Muscles move as a result of these impulses. You can't move specific areas of your body if you're paralyzed or have paralysis. Some individuals are paralyzed for a short period of time before regaining partial or complete movement. You will never restore muscle control if you are paralyzed permanently. It is impossible to reverse the situation.
Any portion of the body might be affected by paralysis. It could be: Partial: You have partial control over some muscles though not all. Complete: You have no control over any of your muscles.