The ruling on swallowing phlegm while fasting

Question:
May Allah reward you. This questioner says: Your Eminence the Shaykh, I suffer from great harm during the month of Ramadan. This is manifested by the fact that from the beginning of the month until its end, I feel a lot of phlegm in my throat, so I constantly get rid of it. But the problem occurs during my work and in the mosque, where I am unable to get rid of it, so I am forced to swallow what I find in my throat. What is the ruling on my fasting? Please inform us, may Allah reward you with good.

Answer:
Something like this does not harm the fast. Keep handkerchiefs with you, and whenever something comes up, spit it into the handkerchief, and praise be to Allah. Even if you are at work, or even if you are in the mosque. What goes to your stomach before it emerges to the mouth does not harm. If it goes from the throat to the stomach, it does not harm. But spitting it out is better and more preferable. However, if it reaches the mouth and then returns, it invalidates the fast. But if it went from your throat, it does not harm it. But using handkerchiefs, striving to spit the phlegm into the handkerchief in the mosque, at work, or anywhere, there is no harm. The matter is broad, and praise be to Allah. And what goes from your throat before it reaches the mouth does not harm the voice.