The main symptom of small cell lung cancer bone metastasis is skeletal pain. Skeletal pain can be vague or severe, and severe pain suggests that pathological fracture may have occurred. In addition, there may be local soft tissue masses, which are harder, less mobile, and have higher local skin temperature. If a spinal bone metastasis occurs, back pain may occur. If a spinal bone causes a pathological fracture, it may lead to paraplegia, incontinence of the bowels and urine, and numbness of both lower limbs. In case of cervical bone metastasis, it can cause dizziness and even difficulty in breathing. In conclusion, the symptoms of small cell lung cancer bone metastasis are mainly determined by the site of bone metastasis. The clinical manifestations are mainly pain, as well as soft tissue masses in the corresponding areas and accompanying clinical manifestations.