Symptoms of end-of-life lung cancer include fatigue, difficulty eating and difficulty breathing, according to OncoLink. Depending on the extent to which the cancer has spread, other, more specific symptoms are also common.
Brain metastases, which are common during advanced stages of lung cancer, result in worsening neurological problems as the patient nears death, notes OncoLink. More general symptoms, such as chronic pain, nausea, or fatigue, often interlink, and the side effects of pain management drugs can exasperate constipation, dry mouth, and drowsiness, according to the American Cancer Society. In the final hours of the disease, many patients also experience.moist, noisy breathing as a result of mucus build up.