Hemiparesis is muscle weakness on one side of the body . Get info on the symptoms, causes, and treatment. Hemiparesis refers to weakness in one side of the body and can occur after a person experiences a stroke. It can make it difficult for people to carry out their daily activities. Learn more here. Is hemiparesis permanent? Hemiparesis can be permanent, but rehabilitation, early intervention, and therapies can help improve function and quality of life for some individuals. What is the difference between hemiplegia and hemiparesis ? Hemiplegia is complete paralysis on one side of the body, whereas hemiparesis refers to partial weakness. Hemiparesis , often referred to as unilateral paresis, is a common result of congenital conditions, injuries, tumors, or strokes that results in weakness on one side of the body (hemi- means half).