This is the 3043rd most frequent Turkish word.
ağrılarının
"Of his/her/its pains" or "of their pains."
In this sentence, 'ağrılarının' (your pains') indicates possession and implies the pain belongs to the subject, specifically localized in the shoulders.
Omuz ağrılarının nedeni kötü duruş olabilir.
The cause of your shoulder pains might be poor posture.
'Ağrılarının' (the pains') shows possessive structure combined with an explanatory detail about migraines.
Migren ağrılarının şiddetini öğrenmek ister misin?
Would you like to learn about the intensity of migraine pains?
Here, 'ağrılarının' (the pains') is used in a context where it describes the chronic type of back pain, emphasizing ownership or association.