Swallowing Saliva, Phlegm or Mucous from the Head and Chest
Issue No. 1341- Swallowing saliva does not invalidate fast, although it may have collected in one’s mouth owing to one’s thinking about sour things. There is no harm in swallowing one’s phlegm or mucous from the head and chest so long as it does not come up to one’s mouth. However, if it reaches one’s mouth, the obligatory precaution is that one should not swallow it.
