Asthma and body posture abnormalities in children and young people are major epidemiological problems worldwide. Asthma among children and adolescents, its relations with physical activity (PA) and PA relations with body posture were and are still being investigated.The aim of this study was to investigate how body posture is shaped in children diagnosed with asthma symptoms and whether body posture is associated with PA. The study involved 192 children. The main group consisted of 90 children diagnosed with asthma and allergies symptoms age 9 to 12 years old (x = 10.75 ± 1.08). The control group included 102 healthy children at the similar age (x = 10.64 ± 1.1). The level of activity has been assessed on the basis of a questionnaire and body posture assessments were done using a plumb line, pediscoliometer, digital inclinometer.Comparison of percentage of respondents fitting into body posture norms clearly indicates higher value in the group classified as active. In the group of participants diagnosed with asthma, percentage differences of participants with good body posture (without postural defects) were statistically significant. Among healthy children, percentages of the participants were higher in active children than in inactive children.Body posture is directly related to PA and the lack of activity affects disturbances within posturometric parameters. Prevention of body posture abnormalities is worth promoting in groups of children, also with various diseases including asthma and allergies symptoms.