If your character broke their leg how would they mend it? If they have a cough who would they see to heal it? If they had depression who could they talk to? Would they staunch their own wounds and hope for the best?
Healing can be confined to the few.
Healing can be given to all.
Your world, your rules.
Medicine can be easily accessible or it can be only for the the wealthy. There could be an underground for doctors and nurses. Healing could be taken from the people as a punishment. Medicine could keep people compliant– given out only as a reward. How does your government heal their people? Or does the government ignore the needs of its people?
Who has the power?
Sickness could shatter a person’s wealth as much as their health– keeping those without money from seeking out what they need. A cure could be too expensive for the common people. What do people sell to afford their life? What is the cost of just one band aid?
If you are writing a book with magic, is healing in the hands of magic-users or in the hands of scientists, or somewhere in between? Witches could brew up a potion to alleviate cramps. Wizards could charm a prosthetic to grow with a child. Mages could ward against malaria. Sorcerers could spell against seasonal affective disorder. Healers could treat gender dysphoria, sculpting bodies by magic.
Is the child mortality rate high? Is a pregnancy ripe with fear for the mother and the child? Is birth control accessible to all who need it? Is it available to people who are biologically female or male? Hidden in back alleys, mages script a morning after spell because it’s disallowed by the crown. Witches create coven of midwives. Wizards draw protective runes across bellies.
Is mental health seen as a stigma? Do empaths work as counselors guiding their patients? Or are people left to suffer in silence, their minds betraying them, while pretending nothing is wrong?
Consider what sort of world you want to build.
What sort of world do you want your story to unfold in?