Disease Description (Causes and Symptoms)
- Definition and pathophysiology: Iron is a component of hemoglobin. Iron deficiency reduces hemoglobin production and red blood cell production in the bone marrow, resulting in reduced oxygen delivery to tissues.
- Main causes:
- Chronic bleeding (heavy menstruation, gastrointestinal bleeding, gastrointestinal bleeding caused by nonsteroidal anti-inflammatory drugs, gastrointestinal tumors, etc.)
- Inadequate intake (when iron intake is insufficient due to a vegetarian diet, etc.)
- Increased demand (growing children and adolescents, pregnancy)
- Malabsorption (small-intestinal disease, intestinal resection, etc.)
- Main symptoms:
- Fatigue, lassitude, dizziness, shortness of breath, tachycardia, pallor
- Mucosal changes: glossitis, angular cheilitis
- Skin and nail changes: pallor, spoon-shaped concave nails
- Pica (a behavior of eating mainly soil or starch; pica)
- Compensation mechanisms: Increased heart rate, preferential perfusion of vital organs, and reduced activity. If prolonged, cardiomegaly and heart failure may occur.
- Reference values (based on literature): Examples of average hemoglobin levels by age — approximately 12 g/dL at 6 months–6 years, approximately 13 g/dL at 7–12 years, approximately 16 g/dL in adult men, and approximately 14 g/dL in adult women (individual variation exists).
Treatment Methods and Precautions
- After diagnosis, correcting the cause is the highest priority (identifying and treating the cause of bleeding, gynecological evaluation in cases of heavy menstruation, etc.).
- Drug treatment
- Oral iron supplements: First-line treatment. Effective in most cases, and continued administration for 6–12 months is recommended to restore iron stores even after the anemia has been corrected.
- Response indicator for oral administration: An increase in Hb of 1–2 g/dL or more within 3–4 weeks after administration suggests a response and may be used as a therapeutic diagnostic indicator.
- Parenteral treatment
- Intravenous (IV) iron: Considered in cases of oral intolerance, malabsorption, ongoing bleeding or substantial iron loss, difficulty adhering to administration, and in dialysis patients. Large doses should be infused slowly over at least 1–1.5 hours.
- Contraindications/precautions: Caution is required in patients with a history of allergy to dextran-containing products or a history of severe allergies. Severe allergic reactions may occur with intravenous administration (reported example: approximately 0.7%), so treatment should be performed in an environment where medical staff can respond immediately.
- Blood transfusion
- Considered in severe anemia (reported in the literature as Hb ≤ 5 g/dL), cardiovascular instability, ongoing massive bleeding, or when immediate treatment is required.
- Because of the adverse effects of transfusion (infection, fever, hemolytic reactions, fluid overload, etc.), correction with iron treatment is preferable whenever possible.
- Lifestyle management and diet
- Intake of iron-rich foods (liver, red meat, egg yolks, green vegetables, grains, raisins, etc.) is recommended.
- Promoting absorption: Absorption increases when taken with vitamin C (fruit, tomatoes, etc.).
- Foods/medications that inhibit absorption: Milk and calcium supplements, green tea, coffee, and black tea (tannins), cereal, antacids, etc. inhibit iron absorption — adjusting the interval between administration is recommended.
- Side effects and precautions
- Oral iron supplements: Gastrointestinal discomfort, abdominal pain, constipation, and black stools (usually normal). If gastrointestinal irritation is severe, consider taking the medication after meals or changing the formulation (syrup or capsule), although absorption may be somewhat reduced.
- Constipation prevention: Increased fiber and fluid intake is recommended.
- Be aware of drug and dietary interactions (especially calcium, tannins, and antacids).
- Check for a history of allergies before intravenous injection.
Checklist Before an Outpatient Visit (Including Preparation and Example Questions)
- Items and records to bring
- List of currently used medications (including iron products), supplements, herbal medicines, etc.
- Recent blood test results (CBC, hemoglobin, serum ferritin, serum iron, TIBC/total iron-binding capacity, transferrin saturation)
- Fecal occult blood test results (if available)
- Previous endoscopy (stomach/colon) results or gynecological examination results (for women)
- Records of recent weight changes and bleeding symptoms (nosebleeds, bloody stools, heavy menstruation)
- Whether pregnancy is possible (women)
- Symptom records
- When fatigue, shortness of breath, or worsening of symptoms during light activity began
- Whether fainting, chest pain, or vertigo has occurred
- Eating habits (whether vegetarian, vitamin C intake, etc.)
- Situations that should be reported to the doctor first during the outpatient visit
- Recent bleeding (even if small but persistent), history of blood transfusion, and drug allergies (especially to dextran, etc.)
Examples of General Questions to Ask the Doctor
- What do you think is the cause of my anemia? What additional tests are needed to identify the cause?
- How should I take the prescribed iron supplement (dose and timing), and what is the expected treatment duration?
- What are the common side effects of this medication and how can they be managed? What should I do if the side effects are severe?
- Is intravenous treatment or a blood transfusion necessary, and if so, what are the advantages and disadvantages?
- I am planning a pregnancy (or am breastfeeding). How should safety considerations or the dosing instructions be adjusted?
- What lifestyle or dietary habits should I change to prevent iron deficiency from recurring?
Examples of Disease-Specific Questions
- (Women with heavy menstruation) My menstrual flow seems heavy. Do I need a gynecological examination? If the anemia does not improve with treatment for heavy menstruation, what procedures are needed?
- (With gastrointestinal symptoms) Gastrointestinal bleeding is suspected. Is endoscopy necessary? What preparation and risks are involved before endoscopy?