Question: While observing Sawm (Fast), I notice that my gum bleeds, especially while performing Wudoo’ (ablution). I wait until the bleeding stops and then I perform Salaah (Prayer); however, my gums bleed again while performing Salaah and the blood leaves a bitter taste in my mouth. Is it Waajib (obligatory) on me to make up for that day?
Answer: If your gums bleed while observing Sawm, you have to spit it out of your mouth. However, if it goes into your throat unintentionally, there is no blame on you and your Sawm is valid. However, if you intentionally swallow the blood that enters your throat, it is Waajib on you to make up for that day... read more here.