Study Finds Childhood Adenotonsillectomy May Raise Risk of Early-Onset Multiple Sclerosis

Possible link between throat surgery and early MS

A new case‑control study published online on May 29 links a history of adenotonsillectomy to higher odds of pediatric‑onset multiple sclerosis (POMS). Researchers from the University of California, San Francisco, recruited children with POMS and matched controls from 16 pediatric MS clinics across the United States.

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The investigators compared surgical histories, demographic factors, and disease characteristics to assess whether removal of adenoids and tonsils influences MS risk. Statistical analysis showed that children who had undergone the procedure were more likely to develop POMS than peers without such a history. The authors suggest that alterations in immune regulation after surgery could play a role.

The study examined over 300 participants, half of whom had been diagnosed with POMS before age 18. Researchers found a noticeable excess of adenotonsillectomy among the POMS group compared with controls. While the exact odds ratio was not disclosed, the association remained significant after adjusting for age, sex, and ethnicity. The team emphasized that the surgery itself does not cause MS, but may act as a trigger in genetically susceptible children. They also noted that the timing of the operation—often performed in early childhood—coincides with a critical window for immune system development.

Could removing tonsils trigger autoimmune disease?

Experts caution against drawing causal conclusions from a single observational study. Dr. Chang, the study’s senior author, explained that adenotonsillectomy could modify exposure to common pathogens, thereby reshaping the immune repertoire. Such changes might inadvertently promote autoimmunity in vulnerable individuals. However, she added that many children undergo the surgery without ever developing MS, underscoring the importance of additional research to clarify mechanisms. Future investigations will need larger cohorts and longitudinal follow‑up to determine whether the observed link reflects a true risk factor or a coincidental association.

If the association proves robust, clinicians may need to discuss potential long‑term implications when recommending adenotonsillectomy for recurrent infections. Pediatric neurologists could also consider surgical history when evaluating children with unexplained neurological symptoms. Until then, the findings serve as a reminder that seemingly routine procedures can have unforeseen effects on immune health.

Frequently Asked Questions

Does adenotonsillectomy cause multiple sclerosis? Current evidence shows an association, not causation. The surgery may influence immune pathways, but most children who have the operation never develop MS.

Should parents avoid adenotonsillectomy for their children? Decisions should still be based on clinical need. Physicians will weigh the benefits of removing chronically infected tissue against any potential long‑term risks.

What research is planned to explore this link further? The investigators aim to expand the study to include more diverse populations and to track immune markers before and after surgery, hoping to uncover biological mechanisms behind the association.