Paralysis refers to a condition in which one or more muscles are unable to move due to loss of function. This can be caused by damage to the nervous system, such as from a stroke or spinal cord injury, or it may result from damage to the nerves that control muscle movement. Paralysis can also occur when there is a problem with the brain's ability to send signals to the muscles, which can happen in conditions like cerebral palsy or multiple sclerosis. Depending on where the paralysis occurs and how severe it is, it may affect an individual's ability to move, speak, eat, or breathe. Treatment for paralysis depends on its cause but can include physical therapy, medication, or surgery.