Why do you often have to blow your nose after crying

Name: Human Anatomy & Physiology
Author: Marieb, Hoehn
ISBN: 9780136874034

검증된 단계별 안내

Understand that crying produces tears, which are primarily produced by the lacrimal glands located above each eye.

Recognize that tears serve to lubricate and protect the eyes, and excess tears drain through small openings called lacrimal puncta into the lacrimal sac and then into the nasal cavity via the nasolacrimal duct.

Know that when you cry a lot, the increased volume of tears overwhelms the drainage system, causing tears to spill over the eyelids and also increase fluid in the nasal cavity.

Realize that the excess fluid in the nasal cavity stimulates the mucous membranes, leading to a runny nose and the sensation of nasal congestion.

Therefore, blowing your nose after crying helps clear the excess fluid and mucus from the nasal passages, relieving the congestion caused by the overflow of tears.

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Tear Production and Drainage

Tears are produced by the lacrimal glands to lubricate and protect the eyes. When crying, tear production increases significantly, and excess tears drain through small openings called puncta into the nasal cavity via the nasolacrimal duct.

Connection Between Eyes and Nasal Cavity

The nasolacrimal duct links the eyes to the nose, allowing tears to flow from the eyes into the nasal passages. This anatomical connection explains why excess tears can cause a runny nose during crying.

Nasal Congestion and Mucus Production

When tears enter the nasal cavity, they mix with mucus, increasing fluid volume and causing nasal congestion. This buildup often leads to the need to blow the nose to clear the excess fluid and mucus.