Anemia syndrome !

Syndrome

Too few red cells or too little hemoglobin: tiredness, pallor, breathlessness on effort and palpitations.

Updated 2026-11-01

See it in 3D: Stomach · Duodenum · Ileum · Spleen

What it is

The anemia syndrome is the set of symptoms and signs produced by low hemoglobin, which reduces oxygen delivery to the tissues. Its features depend on how severe the anemia is and, above all, how fast it develops: chronic anemia is tolerated far better than acute. Beyond recognizing it, the exam looks for clues to its cause.

Key findings

Conjunctival and palmar-crease pallor.
Tachycardia, a functional systolic murmur and, in severe anemia, signs of heart failure.
Spoon nails (koilonychia), angular cheilitis and a smooth, depapillated tongue.
Mild jaundice and splenomegaly in hemolysis.
Neurological changes (vibration sense, gait) in vitamin B12 deficiency.
Petechiae, infections and fever if the other cell lines fail too (aplasia, leukemia).

Pathophysiology

Less hemoglobin means less oxygen delivered; the body compensates with higher cardiac output (tachycardia), redistribution of flow to vital organs and greater oxygen release by hemoglobin.
Skin vasoconstriction and the lower hemoglobin explain the pallor.
Fast flow and lower blood viscosity create the functional systolic murmur.
It arises by three mechanisms: blood loss, too little production in the marrow, or accelerated destruction (hemolysis).
Iron is absorbed in the duodenum and vitamin B12 in the terminal ileum, bound to intrinsic factor from the stomach: gastrectomy, atrophic gastritis or ileal disease cause anemia.

Common causes

Blood loss: heavy menstrual periods, gastrointestinal bleeding (ulcer, colorectal cancer), intestinal parasites.
Low production: iron deficiency (the commonest), vitamin B12 or folate deficiency, anemia of chronic disease, chronic kidney disease, hypothyroidism and marrow diseases.
Destruction: hereditary spherocytosis, G6PD deficiency, sickle cell disease, thalassemias, autoimmune hemolytic anemia and malaria.

Tests that confirm it

Blood count with red-cell indices: mean corpuscular volume classifies anemia as microcytic, normocytic or macrocytic.
Reticulocyte count: high with loss or hemolysis, low with failed production.
Ferritin, vitamin B12, folate and a peripheral smear as suspicion dictates.

Test yourself

Think of the answer, then tap the question to see it.

Where is the pallor of anemia best looked for?

In the palpebral conjunctivae, palmar creases, palms and nail beds, because skin pallor depends heavily on baseline skin color and temperature.

Why can chronic anemia cause few symptoms even when hemoglobin is very low?

Slow onset lets the body compensate: cardiac output rises, flow is redistributed and hemoglobin releases more oxygen to the tissues.

Which exam findings point to iron deficiency?

Koilonychia (spoon nails), angular cheilitis, glossitis and a craving to eat ice or earth (pica), besides pallor.

Which findings suggest that an anemia is hemolytic?

Jaundice with normal-colored urine or more urobilinogen, splenomegaly, a high reticulocyte count and, in some forms, dark urine from hemoglobinuria.

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See it in 3D

The structures of Durgical's 3D anatomy where it is found.

← All of the clinical exam

Educational content on the clinical exam; it is learned and practised under supervision. It does not replace assessment by a health professional and is not for self-diagnosis.

Sources: Anemia | MedlinePlus (MedlinePlus, U.S. National Library of Medicine, 2026); 18.3 Erythrocytes - Anatomy and Physiology 2e | OpenStax (OpenStax, Rice University, 2022).

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Representative model, for educational purposes only.