Hyperosmolar dehydration is usually caused by insufficient water intake or loss of water that is not replenished in time, the patient’s serum sodium is higher than the normal range, the extracellular fluid is hypertonic, and the clinical manifestations are as follows: 1. In severe cases, patients may suffer from neurological damage, such as central nervous system dysfunction, dizziness, headache, nausea, vomiting, and even transient blackness and loss of consciousness. 3. patients may also experience palpitations, chest tightness, panic, shortness of breath, and in severe cases, reduced urine output or even anuria.