Signs and symptoms of hypernatremia

1. Extreme thirst
2. Dry mouth
3. Dark yellow urine
4. Decreased urine output
5. Fatigue
6. Confusion
7. Restlessness
8. Irritability
9. Muscle weakness
10. Nausea and vomiting
11. Seizures
12. Coma (in severe cases)

Neurological:

- Confusion
- Lethargy
- Seizures
- Coma

Gastrointestinal:

- Dry mouth and tongue
- Thirst
- Nausea and vomiting
- Constipation

Cardiovascular:

- Hypotension (low blood pressure)
- Tachycardia (fast heart rate)

Other:

- Muscle cramps and spasms
- Weakness
- Irritability
- Increased body temperature (fever)
- Sunken eyes
- Wrinkled skin
- Decreased urine output