A companion with pots syndrome who can be very sensitive to really bright lights. So whenever they enter the tardis she dims the lights so that it won't bother or hurt them

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A companion with pots syndrome who can be very sensitive to really bright lights. So whenever they enter the tardis she dims the lights so that it won't bother or hurt them
A companion with severe spondiloarthropy has issues getting around the TARDIS because of the stairs and slopes and distances, so the TARDIS compacts corridors and flattens the area where they walk. She also makes sure that when they have to run the companion has a way of getting back quickly
For companions with severe food sensitivities, the TARDIS creates a brand-new kitchen, free of potential cross-contaminants, and keeps it absolutely clean at all times. The Doctor makes sure to bring sensitivity-friendly snacks with him in case they land somewhere that doesn't have food they can eat.
For companions with chronic pain conditions, the TARDIS makes sure to keep extra hot water for the long showers and baths they take, and plays music or provides a book to take their minds off the pain.
A companion with endometriosis that the TARDIS monitors, and refuses to land anywhere when her cycle is at its most painful. The Doctor being sympathetic about the pain, and always making sure he's got something in the TARDIS or his transdimensional pockets that will help ease or even eliminate it.
I've got Crohn's and have played with the idea of asking the Doctor to take me into the future when the cure for IBD has come out. Who knows, maybe there's already something in the TARDIS that could cure me.
a companion with any illness has access to the best medicine for their condition time can offer; the doctor is always there for companions with autoimmune disease when they have a flare-up or relapse; the doctor lets companions pick hats and head coverings from his wardrobe when companions are self-conscious about hair loss
a companion has anxiety and chronic migraines, so the TARDIS connects their room to the zero room and the library, so that the two rooms that relax them the most are right there