In my language we say in daily life to health person "how do you feel? " it has the same meaning as in English phrase "how are you? ", but it's just more warmhearted.
In English I'm not sure if it's used the same, and if it's possible to use this phrase between friends who feel well, and just want use it in meaning of "how are you" in more warmhearted way, or it's used in English only when the doctor or other care-providers ask the patient about his health.
Best Answer
How are you? is the natural, standard question for someone when you want to know about them. Use this between friends, etc. Alternatively, you can use the more colloquial "How's it going?"
How do you feel today? is a question that is looking for a contrast between today and some other time.
You can also use the present progressive to express a longer time when the other person may not have been feeling great.