For the ill person, the stated concern is expected worsening of illness. For the legally qualified traveller, travel itself establishes the category of concession, while the source prefers fasting when no harm results.
Both can entail later make-up of missed days. The underlying reasons for the concession differ; they should not be described with identical conditions.
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Kitab al-Sawm: Illness, Travel, Make-up Fasts and Delayed Qaḍāʾ
For the ill person, the stated concern is expected worsening of illness. For the legally qualified traveller, travel itself establishes the category of concession, while the source prefers fasting when no harm results.
Both can entail later make-up of missed days. The underlying reasons for the concession differ; they should not be described with identical conditions.