This is the 5086th most frequent Turkish word.
hastalıklarına
"To their diseases" or "to their illnesses."
The word 'hastalıklarına' here indicates a possessive plural form ('his/her/its illnesses') directed by the dative case representing 'to' or 'accordance with'.
Hastalıklarına rağmen işe devam etti.
Despite her illnesses, she continued working.
In this sentence, 'hastalıklarına' is used in the dative form with a possessive plural structure, reflecting 'to their illnesses'.
Bu ilaç, bazıların hastalıklarına iyi gelir.
This medication is beneficial to the illnesses of some people.
Here, 'hastalıklarına' signifies the illnesses belonging to a third person and is in the dative case indicating 'for/to'.