Can formaldehyde cause nosebleeds?

In general, whether formaldehyde can cause nosebleeds depends on the concentration of formaldehyde. Detailed analysis is as follows:

When in an environment with high formaldehyde concentration, this harmful substance directly irritates the nasal mucosa, causing blood vessels to dilate and increasing permeability. Prolonged exposure makes the nasal mucosa fragile and prone to rupture and bleeding, thus leading to nosebleeds. Particularly in newly renovated spaces where adequate ventilation has not been achieved and formaldehyde is being released in large amounts, individuals with heightened sensitivity are more likely to experience such symptoms.

Even when exposed to a formaldehyde environment, if the concentration is low, the body's natural regulatory and defense mechanisms may maintain normal nasal conditions, and nosebleeds may not necessarily occur. Additionally, individuals vary in their tolerance to formaldehyde; some people with strong resistance may not show obvious reactions after brief exposure to low formaldehyde concentrations. Moreover, dry climates, nasal diseases, and blood disorders can also cause nosebleeds, so nosebleeds should not be solely attributed to formaldehyde exposure.

It is important in daily life to monitor and control formaldehyde levels in the environment and to avoid high-concentration formaldehyde environments as much as possible while taking appropriate protective measures.