✓Most likely SIADH (Syndrome of Inappropriate ADH secretion) ..
usually it's Seen with infections, stroke, medications, pain, nausea ..
Next Steps
✓some tests like Serum osmolality,
Urine sodium & urine osmolality,
Thyroid function (
TSH) and
Serum cortisol needs to be done .
Health Tips
✓Sodium can fall even after IV treatment if the body is retaining excess water.
✓The problem is not lack of sodium, but imbalance of water hormones.