Fasting persons and other Muslims should beware of what Allah has forbidden, like watching indecent movies which show forbidden things such as pictures of naked and semi-naked people and evil words. The same applies to things that appear on TV which go against the laws of Allah, such as images, songs, musical instruments and misleading advertisements.

If a man shakes hands with a (non-mahram) woman during the day in Ramadan, and he ejaculates, his fast is invalidated. He has to repent to Allah from this sin, refrain from eating and drinking for the rest of the day, and make up for that day’s fast later on.

Smoking is haram and it invalidates your fast because it reaches the stomach and the inside of the body. Everything that reaches the stomach and the inside of the body breaks the fast, whether it is beneficial or harmful.

Committing sins during the day in Ramadan, such as swearing or insulting others, does not break the fast but it detracts from the reward for fasting.

Matters that break the fast only break it when three conditions are met: 1. Knowing the ruling 2. Not forgetting that one is fasting 3. Doing it with free will.

Being given medicine via injection does not break the fast, whether it is intramuscular or intravenous, so long as the injected substance does not provide nutrition.