What is the ruling on making up seven days of Ramadan for someone who was unable to fast due to weakness and suffering from several illnesses?

Whoever breaks their fast in Ramadan, whether due to a valid excuse or not, must make up for it before the next Ramadan. If one neglects to make up for it without a valid excuse until another Ramadan begins, then they must make up the missed days and offer an expiation of one mudd (a measure of food) for each day. However, if the delay was due to a curable illness, then only making up the days is required. If the illness is chronic and incurable, then only feeding the poor is obligatory. The determination of whether illness permits breaking the fast is left to trusted doctors or the individual's own experience.