Right shoulder pain is not necessarily caused by cancer and it is impossible to tell if you have cancer by the location of the pain. Right shoulder pain may also be caused by muscle strain due to trauma or cervical spondylosis due to nerve compression, which manifests itself as skin pain on the surface of the body. Cancer patients may also experience right shoulder pain. Cancer-induced shoulder pain is pain caused by the metastatic spread of cancer cells in the body and lesions. Cancer-induced shoulder pain cannot be localized with the same precision as body skin shoulder pain, and tends to be reflexive or pulling pain, and the area of pain is not the site of the lesion. It is not possible to determine whether or not you have cancer based on which part of your right shoulder hurts, and a comprehensive examination under the guidance of your doctor is needed to determine this. If you have pain in the right shoulder, it is recommended to go to the hospital and ask the doctor for a clear diagnosis and targeted treatment.