QUESTIONS ON FASTING IN RAMADAAN
What is the ruling on the fasting person swallowing spittle or saliva in the daytime?
Swallowing saliva does not break his fast. I do not know any difference of opinion in that regard amongst the people of knowledge. As for mucus and phlegm, they must be spat out once they reach the mouth. It is not permissible for the fasting person to swallow them as he can avoid it.
Phlegm and mucus are not the same as saliva and spittle. There is no harm in swallowing spittle as it is essentially from one’s saliva. If he spits it out, this is fine.
See 30 Questions and Answers on Fasting in Ramadaan by ‘Allāmah Abdul-‘Azīz Ibn Bāz, translated by ‘Abi ‘Abdir-Raḥmān Uways Onwordi at-Taweel
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