Back pain after lying down, there are usually the following reasons: first, such as cervical spondylosis or lumbar spondylosis resulting in cervical disc herniation, cervical disc bulge, compression of which the vertebral artery and blood vessels and nerves, so there will be clinical manifestations of back pain after lying down, to nerve root type of cervical spondylosis especially pain obvious. Second, the back pain after lying down usually has the factor of insufficient blood supply to the large arteries. Usually to coronary atherosclerotic heart disease, the coronary arteries of the heart is not enough blood supply. There are three main branches of the coronary arteries of the heart, namely the left anterior descending branch, the left circumflex branch and the right coronary artery, often with ischemic blockage of the right coronary artery as a typical symptom. Third, back pain when lying down also depends on whether it is due to the chest wall, thorax and lungs, such as herpes zoster, chest wall costochondritis, osteoarthritis and pneumonia of the right lung, will also have clinical symptoms of back pain after lying down.