# Hypothyroidism Due to Seaweed Overconsumption

## TL;DR

Excessive seaweed consumption can lead to hypothyroidism, and detailed dietary history is crucial for diagnosis.

## Contribution

Highlights a novel case linking dairy seaweed overconsumption for health purposes to hypothyroidism.

## Key findings

- Chronic excessive iodine intake from seaweed can cause primary hypothyroidism.
- Detailed dietary history is essential in diagnosing hypothyroidism without thyroid autoantibodies.
- Symptoms of hypothyroidism may not be linked to dietary iodine overconsumption by patients.

## Abstract

Hypothyroidism presents various symptoms, ranging from commonly observed signs, such as fatigue, cold sensation, and constipation, to rare features, such as rash and pancytopenia, resembling certain rheumatological and hematological diseases. Chronic, excessive iodine consumption causes primary hypothyroidism. However, when iodine overconsumption becomes a regular part of daily dietary habits, it becomes difficult for patients to associate their symptoms with daily iodine consumption. Therefore, clinicians cannot obtain information on excessive iodine intake from the patient. Here, we present a case of hypothyroidism that was subsequently identified as caused by excessive dairy seaweed consumption for health purposes. This case report highlights the importance of a detailed dietary history in patients diagnosed with primary hypothyroidism without thyroid autoantibodies.