Why is there pectus excavatum in children

Patient's question:

Over a year, the left side collapsed.

Doctor's answer:

Hello! Rickets caused by calcium deficiency should be treated actively based on clinical manifestations, with the goal of controlling the disease activity and preventing deformities.
Mild active phase: Vitamin D 200,000–300,000 IU, once orally or intramuscularly, with an interval of 1 month. May be repeated 1–2 times. Calcium should also be given, 0.5–1 gram per dose, 2–3 times daily, for 1–2 months.
Moderate to severe active phase: Vitamin D 200,000–300,000 IU, once orally or intramuscularly, with an interval of 1 month. May be repeated 2–3 times. Calcium should also be given, 0.5–1 gram per dose, 2–3 times daily, for 2–3 months.

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