Total 72 clinical symptoms reported for Prader-willi syndrome  Very Frequent (5)Uncommon (1)Occasional (19)Frequent (47)

Cryptorchidism	Testis in inguinal canal. That is, absence of one or both testes from the scrotum owing to failure of the testis or testes to descend through the inguinal canal to the scrotum.   Synonyms:Cryptorchism; Undescended testes; Undescended testis	Very frequent
Hypotonia	Hypotonia is an abnormally low muscle tone (the amount of tension or resistance to movement in a muscle). Even when relaxed, muscles have a continuous and passive partial contraction which provides some resistance to passive stretching. Hypotonia thus manifests as diminished resistance to passive stretching. Hypotonia is not the same as muscle weakness, although the two conditions can co-exist.   Synonyms:Low muscle tone; Low or weak muscle tone; Muscle hypotonia; Muscular hypotonia	Very frequent
Infertility	Synonyms:Infertility	Very frequent
Motor delay	A type of Developmental delay characterized by a delay in acquiring motor skills.   Synonyms:Delay in motor development; Delayed early motor milestones; Delayed motor development; Delayed motor milestones; Locomotor delay; Motor developmental delay; Motor developmental milestones not achieved; Motor retardation; Retarded motor development	Very frequent
Short stature	A height below that which is expected according to age and gender norms. Although there is no universally accepted definition of short stature, many refer to 'short stature' as height more than 2 standard deviations below the mean for age and gender (or below the 3rd percentile for age and gender dependent norms).   Synonyms:Decreased body height; Height less than 3rd percentile; Short stature; Small stature; Stature below 3rd percentile	Very frequent