For hyponatremia caused by lung cancer, patients can usually choose tumor-specific treatment and sodium supplementation treatment. 1. Treatment targeting tumor: Because hyponatremia is caused by lung cancer, therefore, when treating hyponatremia, it is necessary to first start from the source and target the tumor. Common treatments include surgery, radiotherapy, targeted therapy, immunotherapy and so on. 2. Sodium replenishment treatment: this method belongs to symptomatic treatment, and the main method is intravenous infusion of saline. In addition, you can also start from diet, eat some potassium-containing foods in moderation, such as bananas, grapes, grapefruit and so on. All the drugs used in the above treatment measures should be taken under the guidance of a doctor.