If the metastasis of papillary thyroid cancer to lung is single, surgery is feasible; if it is multiple metastases, systemic treatment is usually needed. Papillary thyroid cancer mainly originates from thyroid follicular epithelial cells, most of them do not show obvious symptoms, and a few of them may present painless lump in front of neck. Papillary thyroid cancer is the most common type of thyroid cancer, which is more common in women and may cause lymph node metastasis to lungs, if it is a single metastatic tumor, radical surgical resection is possible. In case of multiple lung metastases, simple surgical resection is basically impossible, and systemic treatment is mostly used. There are many kinds of treatment modalities, such as endocrine therapy, targeted therapy, immunotherapy and so on, and the specific treatment plan needs to be determined by specialists after observing the condition.