Hyponatremia signs and symptoms may include:  Nausea and vomiting Headache Confusion Loss of energy, drowsiness and fatigue Restlessness and irritability Muscle weakness, spasms or cramps Seizures Coma 
hyponatremia signs symptoms may include:  nausea vomiting headache confusion loss energy  drowsiness fatigue restlessness irritability muscle weakness  spasms cramps seizures coma 
hyponatremia