Unlike non-small cell lung cancer, small cell lung cancer grows rapidly and progresses fast, and often metastasizes to distant organs at a very early stage, one of the most common sites of metastasis is the brain, and the tumor metastasized to the brain may gradually grow to compress the nerve tissue and cause dizziness and headache. Of course, there may be other reasons for dizziness, such as anemia. Patients with small cell lung cancer often have severe anemia due to rapid progress and poor treatment effect, and severe anemia will lead to a decrease in the amount of oxygen carried by the blood, resulting in dizziness due to lack of oxygen in the brain. Disorders of electrolyte and acid-base balance may also cause dizziness. Patients with small cell lung cancer may have electrolyte disorders such as hyponatremia and hypokalemia, as well as disorders of acid-base balance such as carbon dioxide retention and acidosis due to pulmonary dysfunction, and these diseases and symptoms may cause dizziness.