Most paralysis is due to strokes or injuries

Most paralysis is due to strokes or injuries such as spinal cord injury or a broken neck. Other causes of paralysis include: Nerve diseases such as amyotrophic lateral sclerosis. Autoimmune diseases such as Guillain-Barre syndrome
The main symptom of paralysis is the inability to move part of your body, or not being able to move at all. It can start suddenly or gradually. Sometimes it comes and goes.
types of paralysis - 
monoplegia, which affects only one arm or leg.
hemiplegia, which affects one arm and one leg on the same side of your body.
paraplegia, which affects both of your legs.
quadriplegia, or tetraplegia, which affects both of your arms and both of your legs.