What should you know about low iron and heat intolerance?

Iron deficiency can cause tiredness, weakness, reduced exercise tolerance, and breathlessness when it leads to anaemia. Heat intolerance means feeling unusually uncomfortable or unwell in warm conditions; it is more directly associated with causes such as an overactive thyroid, some medicines, higher body weight, or changes in heat exposure. These symptoms can occur together without one proving the other.

Heat exhaustion develops when the body loses fluid and salt through sweating. Warning symptoms include heavy sweating, weakness, headache, nausea, dizziness, and faintness.

Arrange a clinical review if heat intolerance persists or low iron has not been confirmed. Blood tests can assess blood count and iron status, while other tests may check thyroid function. In hot weather, rest in a cool place, drink fluids regularly if safe for you, wear light clothing, and reduce strenuous activity during the hottest part of the day. Do not take iron without advice about the dose and cause.

Move to a cool place and seek urgent help for confusion, collapse, inability to drink, worsening weakness, or symptoms that do not improve after cooling and fluids. Heat-related illness can become dangerous. Prompt medical review is also sensible for new weight loss, tremor, persistent fast heartbeat, or severe breathlessness.

Ask whether your symptoms fit iron deficiency, anaemia, thyroid disease, or heat exhaustion, and which blood tests are appropriate. Mention medicines, recent illness, changes in weight, menstrual or other bleeding, fluid intake, and when the heat symptoms began.