Syphilis without symptoms is generally called latent syphilis. Whether asymptomatic syphilis is severe or not cannot be generalized. Some people react late, and some just have latent syphilis, which is seropositive without other symptoms. Of course, there might also be cases where people have relatively high degrees of TRUST or particularly high low degrees of RPR in latent syphilis. In such cases, symptoms might not be mild, and this type is highly contagious, which might lead to abnormalities in the cerebrospinal fluid. If there are abnormalities in the cerebrospinal fluid, these symptoms might not be mild early on and are actually quite serious. Early-stage neurological issues might include memory decline, which is not easily detectable.