What should you know about Jod-Basedow hyperthyroidism?

Iodine is used to make thyroid hormones. In some people with previously unrecognised thyroid autonomy or thyroid disease, a sudden iodine load can increase hormone production. This reaction is called the Jod-Basedow phenomenon. Possible sources include iodine-containing medicines, supplements, contrast used for some scans or other medical products; do not assume every source is suitable to stop without advice.

Hyperthyroidism can present with palpitations, feeling anxious, difficulty sleeping, excessive sweating, heat intolerance, diarrhoea or night sweats. The symptom pattern does not identify the cause on its own. Blood tests and a review of recent iodine exposure help clinicians distinguish this problem from other forms of an overactive thyroid.

Tell your doctor about recent scans, antiseptics, supplements and medicines, including when they were started. Do not take iodine supplements or alter prescribed treatment without guidance. Keep hydrated if sweating or diarrhoea is present, limit stimulants that worsen palpitations and arrange thyroid testing. A clinician may adjust the plan according to symptoms, heart health and test results.

Contact a clinician promptly for a fast or irregular heartbeat, worsening tremor, marked weakness, persistent diarrhoea or increasing heat intolerance. Seek emergency help for chest pain, severe breathlessness, fainting, severe confusion, collapse or a very high temperature with a racing heartbeat.

Ask whether iodine exposure could explain your results, which products to avoid, when thyroid tests should be repeated and how to manage palpitations. Mention pregnancy, heart disease, eye symptoms and every supplement or recent imaging procedure.