Total 51 clinical symptoms reported for Allan-Herndon-Dudley syndrome  Very Frequent (2)Uncommon (6)Occasional (21)Frequent (22)

Axial hypotonia	Muscular hypotonia (abnormally low muscle tone) affecting the musculature of the trunk.   Synonyms:Low muscle tone in trunk; Muscular hypotonia of the trunk; Truncal hypotonia	Very frequent
Intellectual disability	Subnormal intellectual functioning which originates during the developmental period. Intellectual disability, previously referred to as mental retardation, has been defined as an IQ score below 70.   Synonyms:Intellectual disability; Mental deficiency; Mental retardation; Mental retardation, nonspecific; Mental-retardation; Nonprogressive intellectual disability; Nonprogressive mental retardation	Very frequent