why did gandhiji visit the sick …

Gandhi was a first-class nurse to the sick. Where he picked up nursing is a mystery. He certainly did not pass through a nursing school. As many other things, when nursing became necessary to him in life, he learned it the hard way, through experience. In the Ashram at Sabarmati all sick persons came directly under his eye and care. Doctors were, of course, consulted, but the care of the sick person was arranged by Gandhi. It was a joke, especially among young people in the Ashram, that if you wanted to see Gandhi everyday and talk to him and hear him crack jokes you had only to be ill and get into bed! For, Gandhi visited the sick everyday, spent a few minutes at every bed-side, himself saw to things carefully and never failed to crack joke or two with the patient. There was no day too busy for this interlude.
There was once a young lad who went down with dysentery. He had done his best to get to terms with the hard Ashram dietary, but failed. He was an inveterate addict to coffee. But in the Ashram there was no coffee for him - coffee was taboo. In good time he got rid of his dysentery, and was convalescing. Gandhi visited him for a few minutes everyday during his usual rounds. Those few minutes were like a tonic to the poor lad.