We treat the Man In The Disease, not the disease in the man.
So whatever the disease may be, we have to see and learn completely about the man who is he, how is he, what are his dreams, fears, stressful incidences, likes, dislikes, thirst, thermals, hobbies, nature, how he looks, how does he talk, his gestures, etc etc.
I.e. How is he different from every other person in society?
In this universe, every person is different from another person so In homeopathy we have different remedies for different personalities.
We treat by considering these personalities