Taking alectinib does not usually cause a low-grade fever. Aleitinib is a targeted drug for the treatment of lung cancer in patients with locally advanced or metastatic non-small cell lung cancer that is positive for the kinase (ALK) enzyme of mesenchymal lymphoma. Lung cancer patients can have low-grade fever due to high tumor consumption, etc. Low-grade fever is not usually caused by the use of this drug. The more common adverse effects of taking aleitinib include constipation and edema, muscle pain, nausea and vomiting, elevated bilirubin, anemia, rash, itching, and some cause bradycardia. It is contraindicated in patients who are allergic to aleitinib. Precautions, patients diagnosed with interstitial lung disease should not use this product. It is necessary to consider whether to stop using this product according to the severity of the adverse effects of the drug. Suspend this product if tertiary nephrotoxicity occurs while using this product. Alectinib is a prescription drug, need to be used under the guidance of a physician’s visit, the product if adverse reactions should be actively reflected to the attending physician, if necessary, the need to stop, the patient should not self-medication.