Diseases and Conditions
Triple X syndrome
Overview
Symptoms
Causes
Complications
Diagnosis
Treatment
Coping and support
Preparing for an appointment
Overview
Triple X syndrome, also called trisomy X or 47,XXX, is a genetic disorder that affects about 1 in 1,000 females. Females normally have two X chromosomes in all cells — one X chromosome from each parent. In triple X syndrome, a female has three X chromosomes.
Many girls and women with triple X syndrome don't experience symptoms or have only mild symptoms. In others, symptoms may be more apparent — possibly including developmental delays and learning disabilities. Seizures and kidney abnormalities occur in a small number of girls and women with triple X syndrome.
Treatment for triple X syndrome depends on which symptoms, if any, are present and their severity.