In summary, being over 40 years of age is a factor affecting psychosomatic symptoms among workers exposed to xylene or exposed to toluene. Additionally, not wearing personal protective equipment, for example, respirator, is a factor affecting sleep disturbance symptoms among both xylene and toluene exposed groups. However, low concentrations of xylene and toluene have been not related to any symptoms except the concentration of toluene which is associated with reduced tiredness symptom.