Symptom variability and treatment response in pernicious anaemia: a longitudinal daily symptom tracking study

In UK adults with pernicious anaemia, vitamin B12 injections improved composite symptom burden in 71% of 68 participants, but 29% showed no meaningful multisystem improvement.

• Why it matters: Fixed-interval vitamin B12 replacement leaves many patients with persistent or recurrent symptoms, implying substantial heterogeneity in how symptoms respond over time.
• What they did: This prospective observational study used high-frequency daily digital symptom tracking (severity 0–10) for three months, analyzing within- and between-person variability and injection-aligned kinetics across symptom domains.
• The result: Symptom variance was largely driven by stable between-person differences (ICC 0.58–0.80), with cognitive symptoms improving within 24–72 hours, fatigue and pain peaking at 3–5 days, and neuro-sensory symptoms at 4–6 days.

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