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Chronic Blood Loss – Causes, Symptoms and Treatment

Chronic blood loss refers to a persistent, often gradual loss of blood over an extended period of time. It can lead to iron deficiency and anemia and requires medical evaluation.

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Chronic blood loss refers to a persistent, often gradual loss of blood over an extended period of time. It can lead to iron deficiency and anemia and requires medical evaluation.

What Is Chronic Blood Loss?

Chronic blood loss describes a continuous, often small but persistent loss of blood from the body occurring over weeks, months, or even years. Unlike acute blood loss – such as from a traumatic injury – chronic blood loss is frequently unnoticed due to its gradual nature. The body initially compensates through various mechanisms, meaning symptoms may be mild or nonspecific at first. Over time, however, chronic blood loss can lead to significant iron deficiency and ultimately to iron deficiency anemia (low red blood cell count due to insufficient iron).

Causes

The causes of chronic blood loss vary widely and are typically categorized by the site of bleeding:

Gastrointestinal Tract

Gastric ulcers (stomach ulcers) or duodenal ulcers
Inflammatory bowel diseases such as Crohn disease or ulcerative colitis
Colorectal polyps or colorectal cancer
Hemorrhoids
Long-term use of non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or aspirin, which can damage the gastric lining
Angiodysplasias (abnormally enlarged blood vessels in the intestine)

Gynecological Causes

Menorrhagia (excessively heavy menstrual bleeding)
Uterine fibroids (benign tumors of the uterus)
Endometriosis

Other Causes

Chronic urinary tract bleeding (e.g., due to bladder tumors or kidney disease)
Frequent blood draws or blood donations in short intervals
Rare bleeding disorders such as hereditary hemorrhagic telangiectasia

Symptoms

Because the body initially activates compensatory mechanisms, symptoms may remain absent for a long time. As blood loss continues and iron stores decline, the following symptoms can develop:

Fatigue and exhaustion – among the most common presenting symptoms
Pallor of the skin and mucous membranes
Dizziness and headaches
Shortness of breath during physical activity
Rapid heartbeat (tachycardia)
Difficulty concentrating and memory problems
Brittle nails, hair loss, and dry skin (typical signs of iron deficiency)
Restless legs syndrome

Diagnosis

Diagnosis of chronic blood loss involves a combination of medical history, physical examination, and laboratory testing:

Complete blood count (CBC): Detection of anemia (low hemoglobin, low MCV – mean corpuscular volume of red blood cells)
Iron status: Ferritin (iron stores), serum iron, transferrin saturation
Fecal occult blood test: Detection of non-visible blood in the stool
Endoscopy: Gastroscopy and colonoscopy to identify bleeding sources in the gastrointestinal tract
Gynecological examination: For women with heavy menstrual bleeding
Urine analysis and imaging studies if urinary tract involvement is suspected

Treatment

Treatment of chronic blood loss focuses primarily on identifying and addressing the underlying cause of bleeding. At the same time, the resulting iron deficiency is treated:

Treating the Underlying Cause

Medication for gastric ulcers (e.g., proton pump inhibitors, Helicobacter pylori eradication therapy)
Surgical or endoscopic intervention for polyps, tumors, or vascular malformations
Hormonal therapy for menorrhagia or uterine fibroids
Discontinuation or adjustment of medications that irritate the gastric lining

Correcting Iron Deficiency

Oral iron supplements: Ferrous compounds such as ferrous sulfate or ferrous gluconate, taken on an empty stomach for optimal absorption
Intravenous iron therapy: Indicated when oral supplements are not tolerated, in severe anemia, or when oral treatment is insufficient
Dietary adjustments: iron-rich foods (red meat, legumes, dark leafy greens) and vitamin C to enhance iron absorption

When to See a Doctor

Persistent fatigue, unexplained pallor, blood in the stool, or unusually heavy menstrual bleeding should prompt prompt medical evaluation. Chronic blood loss can be a sign of serious underlying conditions that benefit from early diagnosis and treatment.

References

Kasper, D. L. et al. (Eds.) – Harrison's Principles of Internal Medicine, 21st Edition, McGraw-Hill Education (2022)
World Health Organization (WHO) – Anaemia. Available at: https://www.who.int/health-topics/anaemia (2023)
Stein, J. et al. – Iron deficiency and iron deficiency anemia – diagnosis and treatment. Deutsches Ärzteblatt International, 118(5), 71–81 (2021)

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