Fasting
When may a person not fast?
Illness, travel and other excuses are not identical. Read the source-matched issue rather than applying a general slogan.
Common concessions
Conditions matter.
Temporary illnessMay require making up the missed days later.Chronic illnessMay involve a different ruling depending on permanence and ability.TravelA concession exists; the better option can depend on circumstances.Pregnancy and breastfeedingThese require sourced detail and individual circumstances.
Source-first note
Open the related sourced question or methodology page before treating a summary as a personal fatwa.