Pale skin (pallor)

Pallor is a reduction in the pink colour that flowing, oxygen-carrying blood gives the skin and mucous membranes. It is judged most reliably not on the face — which varies with natural complexion — but on the conjunctiva inside the lower eyelid, the lining of the mouth, the palms and the nail beds. The main cause is anaemia, where there is less haemoglobin to colour the blood; here pallor often comes with tiredness, breathlessness and a fast heartbeat. Pallor can also be caused by reduced blood flow to the skin — from cold, shock, low blood pressure, or a faint — and by conditions like hypothyroidism. Sudden pallor with sweating, breathlessness or collapse is a warning sign of acute blood loss or shock and needs emergency care.

• Anaemia — the commonest persistent cause; iron deficiency, B12/folate deficiency, chronic disease, or blood loss.
• Acute blood loss / shock — sudden pallor with sweating and a fast pulse; an emergency.
• Reduced skin blood flow — cold, fainting, low blood pressure.
• Hypothyroidism — pale, sometimes puffy skin.
• Chronic kidney disease — anaemia plus a sallow tinge.
• Naturally fair complexion / lack of sun — not a medical problem.

Persistent pallor points first to anaemia, so the core test is a full blood count with haemoglobin and haematocrit, plus the red-cell indices (MCV, RDW) to narrow the type. Iron studies (ferritin, iron, transferrin) identify iron deficiency — the commonest cause — and B12 and folate cover the other nutritional anaemias. TSH screens for hypothyroidism, and kidney function for the anaemia of chronic kidney disease. If pallor is sudden with signs of bleeding, the priority is urgent assessment, not outpatient tests. Mediora.AI surfaces the haemoglobin, iron and thyroid pattern from your results; the cause and treatment belong with your doctor.