Pain below the right shoulder blade is not a typical sign of cancer. Pain below the right shoulder blade can be associated with muscle strain, fasciitis, pneumonia, and heart disease. However, tumors cannot be completely excluded, but the chance is low. 1. Muscle strain: It is usually caused by too much fatigue or force on the back of shoulder. Usually after rest, the symptoms will be relieved. 2. Fasciitis: Inflammation of the fascia of the right scapula causes the patient to suffer from pain, muscle tension, muscle weakness, muscle spasm, skin numbness, movement disorders and other symptoms. 3. Pneumonia: When pneumonia exists in the patient, symptoms such as fever, chills, malaise, cough and chest pain may occur. Chest pain may also manifest as pain below the right shoulder blade. 4. Heart disease: when the patient has angina pectoris, endocarditis, heart attack and other heart diseases, the pain may radiate to the lower part of the right shoulder blade. 5. Tumor: it may be bone tumor at the primary site or bone metastasis of malignant tumor in other parts, such as breast cancer bone metastasis. Although the pain below the right shoulder blade can not completely exclude the possibility of tumor, but the chance is low, and it can not be taken as the typical manifestation of tumor. If you have any discomfort, you should consult a doctor in time to find out the cause of the disease.