When a person says the Refa’enu blessing (prayer for health) in Shemone Esray, even if the person himself is not sick, he should say it with much concentration. The reason is because if he has in mind that someone else should be healed, he is fulfilling the mitzvah of “Loving one’s fellow”.
4. Be kind to yourself. Speaking badly even about yourself is unethical.
הלכות שמירת הלשון 