There are two possible causes of back pain after a cold: first, the problem of the lumbar muscles, in the case of fever there are many people with more serious symptoms of poisoning, which include fear of cold, general muscle pain, joint pain, and headache, some people will be mainly back pain is the problem of the lumbar muscles; second, after the cold caused damage to the kidneys, the kidneys may be congested in the acute phase, this time may Because of the lesion of kidney causes low back pain. From the symptoms, it is impossible to distinguish between kidney and lumbar muscle problems, so in addition to observing the symptoms, kidney function and urine routine should be checked to determine whether there is kidney damage. Some specific diseases, such as renal syndrome hemorrhagic fever, have initial symptoms similar to those of a cold, but mainly cause kidney damage. Therefore, if you have a cold and have significant back pain, you should consider the possibility of kidney damage.