During a physical exam, a doctor can determine whether the<unk>  occurs primarily during action or at rest. The doctor will also check for<unk>  symmetry, any sensory loss, weakness or muscle atrophy, or decreased reflexes. A detailed family history may indicate if the<unk>  is inherited. Blood or urine tests can detect thyroid malfunction, other metabolic causes, and abnormal levels of certain chemicals that can cause<unk> . These tests may also help to identify contributing causes, such as drug interaction, chronic alcoholism, or another condition or disease. Diagnostic imaging using CT or MRI imaging may help determine if the<unk>  is the result of a structural defect or degeneration of the brain. The doctor will perform a neurological examination to assess nerve function and motor and sensory skills. The tests are designed to determine any functional limitations, such as difficulty with handwriting or the ability to hold a utensil or cup. The patient may be asked to place a finger on the tip of her or his nose, draw a spiral, or perform other tasks or exercises. The doctor may order an electromyogram to diagnose muscle or nerve problems. This test measures involuntary muscle activity and muscle response to nerve stimulation. The selection of the sensors used is important. In addition to studies of muscle activity,<unk>  can be assessed with accuracy using accelerometers . Categories The degree of<unk>  should be assessed in four positions. The<unk>  can then be classified by which position most accentuates the<unk> : Position Name Description At rest Resting<unk> s<unk> s that are worse at rest include Parkinsonian syndromes and essential<unk>  if severe. This includes drug-induced<unk> s from blockers of dopamine receptors such as haloperidol and other antipsychotic drugs. During contraction (e.g. a tight fist while the arm is resting and supported) Contraction<unk> s<unk> s that are worse during supported contraction include essential<unk>  and also cerebellar and exaggerated physiological<unk> s such as a hyperadrenergic state or hyperthyroidism. Drugs such as adrenergics, anticholinergics, and xanthines (such as caffeine) can exaggerate physiological<unk> . During posture (e.g. with the arms elevated against gravity such as in a 'bird-wing' position) Posture<unk> s<unk> s that are worse with posture against gravity include essential<unk>  and exaggerated physiological<unk> s. During intention (e.g. finger to nose test) Intention<unk> s Intention<unk> s are<unk> s that are worse during intention, e.g. as the patient's finger approaches a target, including cerebellar disorders. The terminology of "intention" is currently less used, to the profit of "kinetic".
Tremor
Seizure
Pallor
Catalepsy
Catatonia
Paratonia
Clonus
Psychomotor agitation