The symptoms of back pain at night are as follows: 1. It may be due to the symptoms of upper respiratory tract infection at night, such as influenza, which can lead to viral infection of the body after the body produces viral metabolites and viral stimulation, resulting in the feeling of back pain. 2. It may be due to the cold at night, which causes the body’s muscles to become tense and blood circulation to slow down, leading to the accumulation of metabolites produced by the muscles, resulting in the feeling of back pain. 3. It may be due to strenuous exercise before going to bed, such as strenuous activity during the day, which causes the muscles and the surrounding soft tissues to be in a state of fatigue, and the inflammation and metabolites produced by the body accumulate due to the fast blood circulation, and cannot be metabolized well. The inflammation and metabolic products are not metabolized well, so the peripheral nerves are stimulated, thus producing the symptoms of back pain at night.