Syndromic obesity can be easily differentiated by the absence or presence of the following features:
But, the following points show that there are exceptions to these rules:
Cohen syndrome: V-shaped mouth, temper tantrums, and hyperphagia.
Prader Willi syndrome (PWS): Mental retardation, almond eyes, intrauterine hypotonia, temper tantrums, hypogonadism, and hypogonadotrophic.
Alstrom syndrome: normal stature, no mental retardation, vision abnormalities, and hypogonadotropic hypogonadism in the males only.
Laurence Moon Syndrome: hypogonadotrophic hypogonadism, spastic paraplegic, developmental delay.
Carpenter syndrome: flat nasal bridge, craniosynostosis, and distinctive factors with acrocephaly.