In feng shui, metal (especially iron) is considered a cold weapon and carries negative energy.
Iron items are believed to disrupt a home’s positive energy flow and destroy good feng shui.

Placing metal objects under the bed directly impacts the homeowner’s luck and, over time, may also weaken the household’s overall prosperity.
Therefore, in traditional beliefs, iron is considered an inauspicious material.

From a scientific perspective, iron is associated with the Earth’s magnetic field.
Keeping metal items under your bed may increase magnetic activity around your resting area, which could potentially affect your cardiovascular system and metabolism.

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Too Many Random Items

Leaving clutter under the bed obstructs the circulation of energy (qi) in your home.
Feng shui places great importance on balance and energy flow.
Only when energy moves smoothly throughout the house can the family experience prosperity and blessings.

Disorderly piles of objects can block fortune and hinder wealth, leading to decline in luck and financial difficulties.

From a hygienic standpoint, storing too many things under the bed can create a breeding ground for bacteria.
The space under the bed is usually enclosed, rarely cleaned, and poorly ventilated.
Over time, this environment allows mold and dust to form.
Mold spores can enter the human body and affect health, particularly the respiratory system — posing risks such as lung diseases, especially for elderly people and children.

A dirty under-bed area can also attract pests like cockroaches, mice, and insects, which may nest among stored items and harm human health.

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Broken or Old Objects

Broken or unused items should not be kept in the house — and especially not under the bed.
According to feng shui, storing such items in this location may cause relationship problems, financial loss, conflicts, and family disharmony.

Scientifically, unused or damaged objects simply contribute to clutter and unsanitary conditions, which are unfavorable for health.