There is tentative evidence of an association with undiagnosed celiac disease and improvement after withdrawal of gluten from the diet.Other causes of hemiplegia in adults include trauma, bleeding, brain infections and cancers. Individuals who have uncontrolled diabetes, hypertension or those who smoke have a higher chance of developing a stroke. Weakness on one side of the face may occur and may be due to a viral infection, stroke or a cancer. Common
Vascular: cerebral hemorrhage, stroke, cerebral palsy
Infective: encephalitis, meningitis, brain abscess, cerebral palsy, spinal epidural abscess
Neoplastic: glioma, meningioma, brain tumors, spinal cord tumors
Demyelination: multiple sclerosis, disseminated sclerosis, ADEM, neuromyelitis optica
Traumatic: cerebral lacerations, subdural hematoma, epidural hematoma, cerebral palsy, vertebral compression fracture
Iatrogenic: local anaesthetic injections given intra-arterially rapidly, instead of given in a nerve branch. Ictal: seizure, Todds paralysis
Congenital: cerebral palsy, Neonatal-Onset Multisystem Inflammatory Disease (NOMID)
Degenerative: ALS, corticobasal degeneration
Parasomnia: sleep paralysis

Mechanism
Movement of the body is primarily controlled by the pyramidal (or corticospinal) tract, a pathway of neurons that begins in the motor areas of the brain, projects down through the internal capsule, continues through the brainstem, decussates (or cross midline) at the lower medulla, then travels down the spinal cord into the motor neurons that control each muscle. In addition to this main pathway, there are smaller contributing pathways (including the anterior corticospinal tract), some portions of which do not cross the midline.Because of this anatomy, injuries to the pyramidal tract above the medulla generally cause contralateral hemiparesis (weakness on the opposite side as the injury).
Both physical and occupational therapy can significantly improve the quality of life. Physical therapy
Physical therapy  (PT) can help improve muscle strength & coordination, mobility (such as standing and walking), and other physical function using different sensorimotor techniques. Physiotherapists can also help reduce shoulder pain by maintaining shoulder range of motion, as well as using Functional electrical stimulation. Supportive devices, such as braces or slings, can be used to help prevent or treat shoulder subluxation in the hopes to minimize disability and pain. Although many individuals with stroke experience both shoulder pain and shoulder subluxation, the two are mutually exclusive. A treatment method that can be implemented with the goal of helping to regain motor function in the affected limb is constraint-induced movement therapy. This consists of constraining the unaffected limb, forcing the affected limb to accomplish tasks of daily living. Occupational therapy
Occupational therapists may specifically help with hemiplegia with tasks such as improving hand function, strengthening hand, shoulder and torso, and participating in activities of daily living (ADLs), such as eating and dressing. Therapists may also recommend a hand splint for active use or for stretching at night. Some therapists actually make the splint; others may measure your childs hand and order a splint. OTs educate patients and family on compensatory techniques to continue participating in daily living, fostering independence for the individual - which may include, environmental modification, use of adaptive equipment, sensory integration, etc. Orthotic Intervention
Orthotic devices are one type of intervention for relieving symptoms of hemiparesis.