Mild Nutritional Deficiencies

Even with normal iron levels, low intake of folate, B12, or vitamin C can reduce haemoglobin production.

Chronic Inflammation

Hidden infections or inflammation (like thyroid issues or gut disorders) can suppress haemoglobin slightly.

Overhydration (Dilutional Effect)

Excessive water intake can dilute the blood, leading to slightly lower haemoglobin readings.

Menstrual Blood Loss

Women may experience mild drops in haemoglobin during or after heavy periods—even without anaemia.

Athlete’s Pseudo-Anaemia

Regular intense exercise can increase plasma volume, making haemoglobin appear low though oxygen levels are normal.