Praying for the sick on Shabbat and Yom Tov

Hi,

If a person is dangerously ill, but is not in immediate danger, one should not recite special Tehillim for him on Shabbat or Yom Tov.

However: If the patient requests that people pray today on his behalf, then they should do so, lest he become upset, and have his health damaged, if they would not do so.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 1:105)

Have a great day,
Mordechai