The pain on the right side of the head is less likely to be brain cancer, and is usually caused by insufficient blood supply to the brain, but the exact cause should be analyzed in the context of the patient’s own situation. If the pain on the right side of the head suddenly appears without any head discomfort, it is likely to be caused by insufficient blood supply to the brain. There are many triggering factors for cerebral insufficiency, which may be caused by stress or poor emotion, or may be caused by certain diseases. In addition, if a young person has a pain on the right side of the head, it may be due to a migraine. If elderly people have such symptoms, it may be caused by high blood pressure. In contrast, brain cancer has no obvious symptoms in the early stage, but with the progress of the disease, patients may have persistent headache and the pain may gradually increase, accompanied by nausea, vomiting and other symptoms. Therefore, it is less likely that the pain on the right side of the head is brain cancer. If the pain on the right side of the head is still not gone, you should go to neurology department for medical consultation to clarify the cause after examination.