Williams syndrome may cause symptoms that range in severity. Not all people with Williams syndrome will have the same set of symptoms. Symptoms of Williams syndrome include: Chronic ear infections and/or hearing loss. Dental abnormalities, such as poor enamel and small or missing teeth. Elevated calcium level in the blood. Endocrine abnormalities: hypothyroidism, early puberty and diabetes in adulthood. Farsightedness. Feeding difficulties in infancy. Scoliosis (curve of the spine). Sleep problems. Unsteady walk (gait). Many of the symptoms of Williams syndrome occur in other conditions that are not Williams syndrome and could lead to multiple diagnoses.