Q90-Q99: Chromosomal abnormalities, not elsewhere classified

Q90: Down syndrome

Down syndrome is a genetic disorder that is present at birth and comes under a group of conditions classified as Q90 in the ICD-10 WHO 2016 classification. It is normally caused by the presence of an extra copy of chromosome 21, leading to common physical characteristics and certain health issues. Though the symptoms can vary widely, individuals with Down syndrome generally exhibit similar physical traits like almond-shaped eyes that slant up, a flat facial profile, small stature, and a single crease across the palm. Along with physical developments, Down syndrome can also affect cognitive development resulting in mild to moderate intellectual disabilities. Other possible health complications may include heart defects, digestive problems, hearing and vision problems, and a higher risk for certain infections. It's not a contagious condition and cannot be passed from person to person - it develops purely due to genetic occurrences before birth. The condition lasts the individual's lifetime and the journey of disease progression varies widely from person to person.