The World Federation One Stop Fiqh

Ruling 1673

If due to illness one does not fast in Ramadan, and after Ramadan his illness is cured but another legitimate excuse arises such that he cannot make up the fasts until the following Ramadan, he must make up the fasts he did not keep; and based on obligatory precaution, he must also give one muddof food to a poor person for every missed fast. The same applies if in the month of Ramadan one has another legitimate excuse – other than illness – and after Ramadan that excuse expires and until the Ramadan of the following year he cannot fast due to illness.