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Syndrome reference sheet
Generated 13 Oct 2026
Endocrinology · Endocrinology / Thyroid disorders

Euthyroid sick syndrome

Also known as: Non-thyroidal illness syndrome

Abnormal thyroid hormone levels in severe illness without primary thyroid disease.

Medical specialty
Endocrinology
Subspecialty
Endocrinology / Thyroid disorders
Sex & age distribution
Male: affected; Female: affected; Children: yes
Gene(s) involved
None recorded

Etiology & mechanism

Altered deiodinase activity and TSH suppression during illness.

Gene(s) involved (0)

No gene recorded.

Symptoms & signs (4)

low t3normal or low t4normal tshsigns of underlying illness
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