Shivering before lung cancer surgery and shivering again half a year after surgery may be caused by low blood sugar, brain metastasis of lung cancer and so on. Shivering before lung cancer surgery and shivering half a year after surgery may be caused by low blood glucose. Lung cancer patients may suffer from low blood glucose due to loss of appetite and poor diet, which may lead to sweating, panic, shivering and pallor, etc. Oral or injected glucose can be taken under doctor’s instruction to relieve the symptoms. Shivering before lung cancer surgery and shivering half a year after surgery may have brain metastasis. When cancer metastasizes to the brain, symptoms such as dizziness and headache may appear in early stage, and as the lumps increase in size, symptoms such as nausea, vomiting, shivering and even hemiplegia of limbs may appear. Therefore, when people shiver before lung cancer surgery and then shiver half a year after surgery, they should go to the hospital as soon as possible to clarify the cause of the disease and carry out symptomatic treatment after diagnosis.