Hyponatremia usually has no sequelae when corrected in time, but if left untreated, symptoms such as impaired limb movement and speech disorders may occur. Complications such as water intoxication and cerebral edema may also occur if treatment is not timely. 1. Paralysis, speech disorders: hyponatremia, if not treated in time, may lead to limb movement disorders, speech disorders and other sequelae. 2. Water intoxication: Hyponatremia can lead to water intoxication, which is manifested as mental confusion, and in severe cases, convulsions and coma may occur, and the sequelae may remain after treatment. 3. Cerebral edema: mainly manifested as nausea, vomiting, headache, drowsiness, muscle spasm, psychoneurological symptoms, etc., which may leave sequelae if not treated in time. Patients with hyponatremia should be actively treated to remove the causes and treat the symptoms.