<unk>  can be a symptom associated with disorders in those parts of the brain that control muscles throughout the body or in particular areas, such as the hands. Neurological disorders or conditions that can produce<unk>  include multiple sclerosis, stroke,<unk> aumatic brain injury, chronic kidney disease and a number of neurodegenerative diseases that damage or destroy parts of the brainstem or the cerebellum, Parkinson's disease being the one most often associated with<unk> . Lesions of the Guillain-Mollaret<unk> iangle (also called myoclonic<unk> iangle or dentato-rubro-olivary pathway) impair the predictions performed by the cerebellum, causing repetitive muscle discharges by<unk> iggering oscillatory activity in the central nervous system. Other causes include the use of drugs (such as amphetamines, cocaine, caffeine, corticosteroids, SSRIs) or alcohol, mercury poisoning, or the withdrawal of drugs such as alcohol or benzodiazepine.<unk> s can also be seen in infants with phenylketonuria (PKU), overactive thyroid or liver failure.<unk> s can be an indication of hypoglycemia, along with palpitations, sweating and anxiety.<unk>  can also be caused by lack of sleep, lack of vitamins, or increased stress. Deficiencies of magnesium and thiamine have also been known to cause<unk>  or shaking, which resolves when the deficiency is corrected.<unk> s in animals can also be caused by some spider bites, e.g. the redback spider of Australia.
Tremor
Seizure
Pallor
Catalepsy
Catatonia
Paratonia
Clonus
Psychomotor agitation