This is true. You have to make up for the missed days and then fast the 6 days of Shaw’al.

I heard that first we should keep fast for the days which we missed in ramadan then 6 days of shawwal so is it must to keep first missed days of ramadan then 6 days of shawwal please clarify it sheikh..

Fasting | March 30, 2014 5:56 pm
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If i fasted 3 day of the 6 days of shawwal and the month is over can i still fast in the next month?
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Someone told me to ask u this question,actually this person is suffering from ulcer and he has to take medicines and he gets vomiting while he is fasting so in that condition is it premissible for him to fast?