Dr Ann Nillsen

Sydney Paediatric Endocrinologist

MBBS, BMedSci(Hons), DCH, FRACP

Dr Ann Nillsen is a Paediatric Endocrinologist providing caring, personalised endocrine care for children and adolescents.

When concerns arise about your child’s growth, development, hormones or diabetes, finding the right specialist can make a real difference.

Dr Ann Nillsen is a caring and compassionate Paediatric Endocrinologist who is passionate about providing thoughtful, individualised care for children and adolescents. She understands that concerns about a child’s health can be worrying for parents and families. Ann takes the time to listen, answer questions and explain things clearly, helping families feel informed, supported and confident in their child’s care.

Ann consults at Sydney Endocrinology in North Sydney and is also a Staff Specialist Paediatric Endocrinologist at Royal North Shore Hospital. She has previously worked at paediatric centres across New South Wales, Queensland and Western Australia, bringing broad clinical experience to the care of children and young people.

Ann is committed to working in partnership with children, adolescents and their families to understand their concerns and develop an approach to care that meets each child’s individual needs.

Her research achievements include receiving the ANZSPED Emerging Investigator Award for original, multicentre diabetes research.

What conditions does Dr Ann Nillsen treat?

Paediatric endocrinologists specialise in conditions affecting children’s hormones, growth, puberty, metabolism and development.

Ann’s areas of practice include assessment and management of:

Diabetes and blood glucose

• Type 1 diabetes

• Type 2 diabetes in children and adolescents

• Other forms of diabetes, including monogenic diabetes

• Hypoglycaemia and certain disorders of blood glucose regulation

Thyroid conditions

• Underactive thyroid (hypothyroidism)

• Overactive thyroid (hyperthyroidism)

• Hashimoto’s thyroiditis

• Graves’ disease

• Thyroid nodules and other thyroid disorders

Growth and development

• Short stature and concerns about slow growth

• Excessive or unusually rapid growth

• Growth hormone deficiency and other growth hormone disorders

• Delayed growth and delayed bone maturation

• Advanced bone age

Puberty and reproductive hormones

• Early or precocious puberty

• Delayed puberty

• Disorders of pubertal development

• Hormonal concerns affecting menstrual development

• Differences of sex development

Pituitary and adrenal conditions

• Pituitary hormone disorders

• Growth hormone excess or deficiency

• Adrenal insufficiency, including Addison’s disease

• Congenital adrenal hyperplasia

• Cushing’s syndrome and other adrenal hormone disorders

Bone, calcium and mineral health

• Low bone density and osteoporosis

• Rickets and other disorders of bone mineralisation

• Calcium and phosphate disorders

• Vitamin D-related bone conditions

• Disorders of parathyroid hormone regulation

Other hormonal and metabolic conditions

• Disorders of water balance, including diabetes insipidus

• Disorders of calcium regulation

• Certain genetic or congenital endocrine conditions

• Other hormonal conditions affecting childhood growth, development and wellbeing

If you are concerned about your child’s growth, puberty, diabetes or hormones, your GP can help determine whether a paediatric endocrinology consultation may be appropriate.

Specialist paediatric endocrinology in North Sydney

Sydney Endocrinology is delighted to welcome Dr Ann Nillsen to our multidisciplinary team, expanding access to specialist endocrine care for children and adolescents.

We understand that seeking specialist care for your child can feel overwhelming. Our team is here to help guide you through the appointment process and answer your booking enquiries.

For appointments and enquiries, Please call our friendly reception team 0291579095

DR Ann Nillsen’s consulting days: