Lung tumor may cause fainting if it is malignant and distant metastasis such as brain metastasis and electrolyte disorder have occurred.
1. Lung cancer brain metastasis: brain is a common metastatic site of lung cancer, small cell lung cancer, adenocarcinoma, undifferentiated carcinoma and squamous carcinoma all have the possibility of brain metastasis. Brain metastasis of lung cancer causes intracranial occupation, increased intracranial pressure and cerebral edema, which may result in headache, fainting, consciousness disorder, fatigue, nausea, vomiting and lethargy.
2. Electrolyte disorders: patients with advanced stage of lung cancer may suffer from loss of appetite, multiple organ function damage, etc., which may cause electrolyte disorders, resulting in hyponatremia, hypokalemia, hypochloremia, hypocalcemia, fainting and palpitation.
3. Lung cancer metastases compressing superior vena cava: it can cause superior vena cava syndrome, cerebral edema, increased intracranial pressure, etc., which can be manifested as headache, aggravation of vomiting, confusion, fainting, coma and so on.
If the above symptoms are serious, or if the symptoms persist and do not get better, the patient should go to the hospital in time for treatment.