If you came in while Tarawih prayer was in progress, or the imam started to pray Tarawih shortly after ‘Isha, and there is the fear that if a second jama'ah prays, the two groups will disturb one another, then in this case it is better to join the imam in Tarawih, with the intention of praying ‘Isha.

If an illness, such as a cold or cough, harms or annoys others, Islamically, one may miss the congregational prayers. Scholars cite Hadiths regarding offensive odors and contagious diseases as evidence that one may pray at home until they recover.