What happens if I don't fast in Ramadan?

It depends on why you didn't fast. If you had a valid excuse like illness, travel or your period, there is no sin and you simply make up the days later. If you skipped without an excuse, it is a serious sin, but you can repent, make up the missed days, and Allah's forgiveness is open to you.

Missing fasts with a valid excuse

Islam excuses several groups from fasting: the sick, travellers, women who are menstruating or bleeding after childbirth, and often pregnant or breastfeeding women. There is no sin at all. You make up each missed day before the next Ramadan if you can. See Do I have to make up missed Ramadan fasts?

People who can never fast, such as the elderly or those with a long-term illness, feed one poor person for every missed day instead. See What is fidya in Islam?

Skipping without an excuse

Fasting Ramadan is one of the five pillars of Islam (Sahih al-Bukhari 8), so leaving it deliberately is a major sin. It does not, by itself, take you out of Islam if you still believe fasting is a duty, but it is something to take seriously. What you owe depends on what happened:

You didn't start the fast at all: repent and make up the day.
You broke a fast by eating or drinking on purpose: repent and make up the day. The Hanafi and Maliki schools also require kaffarah for this, while the Shafi'i and Hanbali schools do not.
You broke it with sexual intercourse: all four schools require kaffarah (expiation), as in the case of the man who came to the Prophet ﷺ (Sahih al-Bukhari 1936). See What is kaffarah for breaking a fast?

The door of repentance is open

Feeling guilty is a good sign: it means your heart is alive. Don't let shame push you further away. Sincere repentance means stopping, regretting it, and resolving not to return, then making up what you missed.

قُلْ يَـٰعِبَادِىَ ٱلَّذِينَ أَسْرَفُوا۟ عَلَىٰٓ أَنفُسِهِمْ لَا تَقْنَطُوا۟ مِن رَّحْمَةِ ٱللَّهِ ۚ إِنَّ ٱللَّهَ يَغْفِرُ ٱلذُّنُوبَ جَمِيعًا ۚ إِنَّهُۥ هُوَ ٱلْغَفُورُ ٱلرَّحِيمُ "Say, 'O My servants who have transgressed against themselves [by sinning], do not despair of the mercy of Allah. Indeed, Allah forgives all sins. Indeed, it is He who is the Forgiving, the Merciful.'" Quran 39:53

The Prophet ﷺ said that Allah stretches out His hand at night to accept the repentance of those who sinned during the day, and during the day for those who sinned at night (Sahih Muslim 2759). See Will Allah forgive me if I keep committing the same sin?

What about years before I became Muslim?

Nothing is owed for Ramadans before your shahada. Islam wipes out what came before it, so you start fresh from the day you accepted Islam.

Key points

Missing fasts for a valid excuse is no sin; make them up later.
Skipping deliberately is a major sin that needs repentance and make-up days.
Breaking a fast with intercourse also requires kaffarah.
Ramadans before your shahada don't need to be made up.

Tip: Write down how many days you owe and pick a regular day, like every Monday, to make them up. Small, steady steps clear the list faster than you think.

What happens if I don't fast in Ramadan?

Missing fasts with a valid excuse

Skipping without an excuse

The door of repentance is open

What about years before I became Muslim?

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