Parallel Autonomic regulation of Cough and Runny Nose
Skymninge mentioned opioidreceptors and the withdrawal symptom of opiods as a runny nose: codein binds to opioidreceptors.

I think now that the cough can trigger runny nose.
I breathed with empty nose some 15 minutes.
Then, I had a deep dry cough and right after it a stuffy nose.
I really felt this time the negative gradient at the level of kidneys and also posteriorly.
I do not know how this kind of pain was felt, I think, near or on the kidneys.
I do not understand the effects of deep dry coughs.
They seem to be linked to several processes and locations in the body.

After this deep dry cough, I did some abdominal breathes and this way massaging the lymphatic circulation systemically, the stuffy nose disappeared.
My thorax is opposite of astonic person (say if you remember the name in Propedeutics).
This can be a restricting factor in the circulation of the lymph.

My conjecture is that the people with big chests (opposite of astonic) need to concentrate more on abdominal breathing such that to keep out of stuffy noses.
Restricted lymphatic circulation causes less wastes returned to the blood circulation.
Thus, accumulation of bacteria in the larynges which increases the risk of a dry cough.
Good lymphatic circulation ensures that bacteria is not congested in the larynx.
So cough seems to be a mechanism to start a runny nose.

This all is finely regulated.
There are several receptors in the body.
The deep cough however seems to be linked to a reflex which causes a runny nose.

Some studies about opiates and respiratory activity


The effects of opiates on the respiratory activity of thoracic motoneurones in the anaesthetized and decerebrate rabbit.