1) During Travelling.
2) Pregnant women whose health is endanger.
3) Breast feeding women who fear their milk will dry up.
4) Severe sickness/illness.
5) Old age
6) Fear of death due to weakness.
7) Insanity (Psychosis, Madness, Mental illness).
Note: It is compulsory to keep the missed Fasts, but the old who are totally incapable of keeping the missed fasts must give fidya (a ransom meal to a needy person) for every fast missed. Those permitted not to fast should not eat or drink openly but secretly.