What if thyroid hormone replacement does not relieve cold intolerance?

If thyroid hormone replacement does not relieve cold intolerance, arrange a review to check treatment, thyroid tests, and other possible causes. Symptoms may persist if the dose or absorption needs attention, if doses are missed, or if the cold feeling is not caused by low thyroid activity. Do not increase or stop the medicine without prescriber guidance.

Thyroid hormone replacement supports the body when thyroid hormone production is low, but symptom improvement can vary. Taking the medicine with certain foods, supplements, or other medicines can affect absorption. Cold intolerance may also occur with anaemia, circulation problems, low body weight, or other endocrine conditions. Read about [Cold Intolerance](/symptoms/cold-intolerance/) and the treatment [Thyroid Hormone Replacement](/treatments/medical-management/thyroid-hormone-replacement/).

Take the replacement exactly as prescribed and keep a record of missed doses, timing, and products taken near it. Tell the clinician about iron, calcium, antacids, supplements, pregnancy, bowel symptoms, and changes in weight or energy. They may review thyroid blood tests, how the medicine is taken, and symptoms such as constipation, dry skin, palpitations, tremor, or sleep changes. Keep warm safely, but avoid using very hot devices on numb skin.

Arrange prompt medical advice if cold intolerance is accompanied by marked tiredness, swelling, worsening constipation, slowed thinking, or a substantial change in weight. Seek urgent help for confusion, unusual sleepiness, fainting, chest pain, severe weakness, or a very slow heartbeat. Palpitations, shaking, sweating, or severe anxiety after a dose change also need prompt review.

Ask whether your thyroid tests and dose need review, whether another medicine affects absorption, how to separate replacement from supplements, and what other causes of cold intolerance should be checked.