Muscle weakness or paralysis with associated<unk>  (though potassium levels can be normal)
Sometimes painful though often painless
Weakness can be from hand to leg to complete paralysis
Strenuous exercise
High carbohydrate meal
High sodium meals
Sudden changes in temperature
Emotional stress
Attacks can last several hours to several days
Reflexes are decreased or absent
Shoulders and hips, are involved more often than the arms and legs.
There is flaccid paralysis rather than hypertonia
There should not be myoclonus or spasticity
Hypokalemic periodic paralysis
Neuromuscular weakness
Thyrotoxic periodic paralysis
Upper motor neuron:
Tianeptine toxicity
CVA
Yohimbine toxicity
Hemorrhagic stroke