Problems with the cervical spine can cause weakness in the legs. Problems with the cervical spine may cause weakness of the legs, mainly because the nerves that innervate the legs need to pass through the cervical spine. If cervical spine problems occur, the spinal nerves at the back of the spine are compressed, and nerve dysfunction in the lower limbs is likely to occur, resulting in weakness and tenderness of the legs. The nerve dysfunction of the lower limbs caused by cervical spine compression mainly includes soreness, weakness and stiffness of joints, and the patient tends to experience stiffness or weakness when moving around. If the compression on the nerves of the lower limbs is too serious, it may also cause abnormalities in walking, sensation and even reflexes, and some patients may show symptoms such as inability to walk in a straight line and easy to fall. If patients experience long-term weakness of the legs, accompanied by cervical spine discomfort, it is recommended that they go to the hospital for relevant examinations in a timely manner, so as to avoid delay or aggravation of the condition.