Weak positive syphilis test may be caused by syphilis infection, or it may be caused by false positive. 1. Infection of syphilis: after the patient is infected with syphilis, due to the early stage of infection, the body temporarily does not produce enough antibodies, so it will show a weak positive during the test, which needs to be combined with the clinical to identify. 2. False-positive: a variety of infectious diseases, connective tissue disease may cause false-positive, so the syphilis weak positive. For example, rubella, chicken pox, viral hepatitis, rheumatoid arthritis, lupus erythematosus, dry syndrome and so on. There are also a very small number of pregnant women, elderly people and even normal people who may have positive syphilis serology Syphilis weak positive patients, it is recommended to go to the hospital in time to improve the examination and clear diagnosis, so as not to delay the condition.