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When squatting, the human body is contracted, and the internal pressure of the human body, including blood pressure, increases, so that the body fluids stored in the gland are compressed and eliminated.
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This SB on the 1st floor, Nima you pee and squat? If you don't know, don't talk nonsense. I, like LZ, only have tears when I have a rush to urinate and defecate.
Maybe this has become a kind of conditioned reflex for you, I wonder if you remember the first time you went to the toilet and shed tears after being sensible?
The tearing phenomenon you mentioned is mainly caused by dacryocystitis. Considering that you have been for a long time, it is recommended that you do a specific examination in the ophthalmology department of the hospital, and if it is diagnosed as being caused by dacryocystitis, you are doing further treatment, and I wish you a speedy recovery.
If you have internal organ problems or the large intestine, go to the proctology department to have a look.
That's because the top of the sewer pipe is sealed by someone, and there is no air outlet, so the dirty water can't go down in the curved pipe, forming a vacuum.