Heat and cold intolerance causes

Feeling unusually cold may occur with anaemia or iron deficiency anaemia, especially when it comes with tiredness, pale skin, breathlessness on exertion, or a fast heartbeat. Hypothyroidism can slow body processes and may cause sensitivity to cold, dry skin, constipation, weight changes, or low energy. Heat sensitivity may be linked to an overactive thyroid, fever, hormonal changes, some medicines, anxiety, or reduced ability to cool the body. These patterns are clues rather than a diagnosis.

A clinician may ask when the problem began, whether it affects heat, cold, or both, and whether there are changes in weight, periods, sleep, sweating, appetite, or energy. They may review medicines and examine your pulse, skin, thyroid area, and circulation. Blood tests can help assess blood count, iron stores, and thyroid function.

Keep a brief record of temperature triggers, associated symptoms, medicines, and menstrual or illness-related changes. Dress in adjustable layers, avoid sudden extremes, drink regularly, and take breaks in a cool or warm environment as needed. Do not start iron or thyroid treatment without medical advice; the correct treatment depends on the cause. If symptoms persist, arrange a primary-care assessment. Thyroid hormone replacement may be used when testing confirms an underactive thyroid.

Seek urgent help for confusion, fainting, severe weakness, trouble breathing, chest pain, a very high or unusually low body temperature, or inability to stay awake. Arrange prompt medical review for new symptoms that are worsening, unexplained weight change, repeated palpitations, heavy bleeding, or cold fingers or toes with pain or colour change.

Ask which symptoms point toward a thyroid or blood disorder, whether you need blood count, iron, or thyroid tests, and whether any medicine could be affecting temperature tolerance. Ask what changes should prompt urgent care and when your results should be reviewed.