Opinion | Congenital Hypothyroidism: India’s Preventable Rare Disease Crisis

As we observe Rare Disease Day on 28 February, we must recognise that some rare diseases are not only treatable but also preventable

February is observed globally as Rare Disease Awareness Month, culminating in Rare Disease Day on 28 February. According to the World Health Organization (WHO), a disease is classified as rare when it affects fewer than 1 in 10,000 individuals. India does not yet have a uniformly adopted national definition, but the burden is substantial.

The greatest challenge in rare diseases is not treatment; it is early suspicion and diagnosis. Many conditions show no visible signs at birth. By the time symptoms appear, irreversible damage may already have occurred. One such condition is Congenital Hypothyroidism (CH) — a disorder that is entirely treatable if detected early, yet devastating if missed.

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What is Congenital Hypothyroidism?

Congenital Hypothyroidism occurs when a newborn is born with an absent, underdeveloped, or poorly functioning thyroid gland. The thyroid produces thyroxine (T4), a hormone essential for brain development, growth, and metabolism. Thyroxine plays a critical role in neuronal migration, myelination, and synapse formation during the first two to three years of life — especially in the first few weeks after birth. A deficiency during this narrow window can result in permanent intellectual disability, growth failure, hearing impairment, and motor delays. The tragedy is that affected babies usually appear completely normal at birth.

In Western countries, the incidence of CH ranges between 1 in 2,500 and 1 in 3,000 live births. In India, however, studies suggest a significantly higher incidence: approximately 1 in 1,000 newborns. Data from the National Neonatology Forum of India indicate that India records nearly 26 million births annually. Conservative estimates suggest that around 10,000 babies are born each year with Congenital Hypothyroidism. That translates to: 27 babies every day, more than one baby every hour. Each of these babies could live a completely normal life, if diagnosed within the first two weeks.

Research from tertiary centres in Delhi, Hyderabad, and Chennai consistently reports higher prevalence rates than global averages. A multicentric study by the Indian Council of Medical Research (ICMR) found prevalence rates close to 1 in 1,200 among screened newborns, but we have found nearly 1 in 900 babies are affected with this condition at birth.

Possible contributing factors include:

• Iodine imbalance in certain regions

• Genetic predisposition

• Consanguineous marriages in some communities

• Absence of universal newborn screening

A Rs 50 Test That Saves a Lifetime

Congenital Hypothyroidism can be diagnosed through a simple heel-prick blood test performed 48-72 hours after birth. The test measures Thyroid Stimulating Hormone (TSH) levels. In large-scale programmes, it costs approximately Rs 50 per baby. If diagnosed and treated with oral levothyroxine within the first 14 days of life, the child’s intellectual and physical development remains normal. Delay beyond the first few weeks, however, can result in irreversible brain damage.

Studies from Europe and North America show that untreated CH can reduce IQ by 30-50 points. Early-treated children, in contrast, demonstrate cognitive outcomes comparable to healthy peers. The difference between a normal future and lifelong disability lies in a tiny drop of blood.

The financial implications of untreated CH are enormous. The lifetime cost of caring for a child with severe intellectual disability includes:

• Repeated hospital visits

• Rehabilitation therapies

• Loss of parental income

• Long-term dependency

International economic models estimate that for every dollar invested in newborn screening for CH, society saves $5-10 in long-term costs. In India, where out-of-pocket healthcare expenditure remains high, the burden on families can be catastrophic. A preventable disability becomes a lifelong socioeconomic crisis—not just for households but for the nation.

Vaccines Save Lives, Screening Saves Futures

India has made significant progress in reducing Neonatal Mortality Rate (NMR) and Infant Mortality Rate (IMR) through immunisation and maternal health programmes. Vaccination prevents infectious deaths. But survival alone is not enough. Quality of life matters equally. Congenital Hypothyroidism does not typically cause infant death. It causes silent, irreversible intellectual disability if undetected. Unlike vaccines, newborn screening lacks strong industry advocacy.

Without policy prioritisation, it remains under-implemented. Most developed nations have screened newborns for CH for over five decades, virtually eliminating it as a cause of intellectual disability. India, despite rapid economic growth, still lacks mandatory nationwide screening.

India urgently needs a clear national rare disease definition aligned with global standards. We must make universal newborn screening mandatory for Congenital Hypothyroidism. Integration of CH screening into all public and private birthing centres, along with public awareness campaigns for parents and healthcare providers, will help. Centralised data collection to track prevalence and outcomes should also be implemented.

Every hour in India, a baby is born with Congenital Hypothyroidism. Without screening, many of these children will develop preventable intellectual disability — through no fault of their own.

The science is established. The test is simple. The treatment is affordable. The outcome is preventable. As we observe Rare Disease Day on 28 February, we must recognise that some rare diseases are not only treatable but also preventable. India has the expertise, infrastructure and resources. What is needed now is policy commitment and public will. Because protecting a child’s brain at birth is not optional — it is a national responsibility.

The writer is President, National Neonatology Forum of Karnataka [2025-27] and Founder Chairman & Neonatologist, Cloudnine Group of Hospitals. Views expressed in the above piece are personal and solely those of the author. They do not necessarily reflect News18’s views.

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