There are many reasons why this might happen. It can be from previous damage cause by lifting something improperly, sport injury, etc. But for women, it typically happens during their period and is caused by the uterus contracting.
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to reduced the back flow of water because when water comes out from the runner the pressure is lower then the atmospheric pressure due to this back flow is generated.
I have one of these too. If you have found out anything I would sure love to know.
lower
"lower amplitude"
IR: longer wavelength, lower frequency, lower energy per photon.Visible: medium wavelength, medium frequency, medium energy per photon.UV: shorter wavelength, higher frequency, higher energy per photon.