The increase in prevalence of asthma and other allergic diatheses has rarely been documented in the developing sub-Saharan countries. We assessed time trends in symptoms of asthma, allergic rhinoconjunctivitis, and atopic eczema among children in Ibadan, Nigeria, with cross-sectional data from 2 International Study of Asthma and Allergies in Childhood questionnaire-based surveys conducted 7 years apart in 1995 and in 2001-2002. The prevalence of current wheeze increased nonsignificantly in the 6- to 7-year age group (4.8%-5.5%) and significantly in the 13- to 14-year age group (10.7%-13.0%) (p = .249 and p = .005, respectively). The 12-month prevalence of allergic rhinoconjuctivitis decreased insignificantly in the 6- to 7-year age group (p = .833) but significantly in the 13- to 14-year age group (p = .001), while the diagnosis of atopic eczema decreased in both age groups. The current findings suggest that the symptoms of asthma have only increased significantly in the Nigerian adolescents.