Numbness in the back is not necessarily an early sign of cancer, it may be caused by lumbar disc herniation or cervical spondylosis, so it is not certain whether it is an early sign of cancer.
Cancer in the early stage generally does not have obvious clinical symptoms, only in the middle or late stage of the disease, there will be some obvious clinical symptoms, so only through the numbness of the back is very difficult to determine whether it belongs to the cancer disease.
The numbness of the back may also be caused by lumbar disc herniation and cervical spondylosis, both of which may compress the surrounding blood vessels and nerve tissues, and easily lead to radiating pain in the lumbar region and the back, accompanied by numbness of the upper limbs or restricted movement and other symptoms.
You can go to the hospital for examination through imaging methods, mainly including CT examination and MRI examination. Through whole-body imaging examination, you can determine whether there is cancerous lesion or not, and also confirm whether there is lumbar spine and cervical spondylosis.