There are several common causes of infertility in women, including:

1. Ovulation disorders: Irregular or absent ovulation can make it difficult for a woman to conceive.
2. Polycystic ovary syndrome (PCOS): This condition can cause hormonal imbalances and infrequent or absent ovulation.
3. Endometriosis: The presence of endometrial tissue outside the uterus can interfere with conception.
4. Age-related factors: As a woman gets older, her fertility decreases due to declining egg quality and quantity.
5. Fallopian tube damage or blockage: Issues with the fallopian tubes can prevent the egg from meeting the sperm for fertilization.
6. Uterine or cervical abnormalities: Abnormalities in the uterus or cervix can interfere with implantation or the passage of sperm.
7. Smoking, excessive alcohol consumption, and poor diet: These lifestyle factors can negatively impact fertility.
8. Medical conditions: Conditions such as thyroid disorders, diabetes, and autoimmune diseases can affect fertility.
9. Weight issues: Both being underweight and overweight can impact hormonal balance and fertility.
10. Pelvic inflammatory disease (PID): Infections in the reproductive system can cause scarring and damage to the fallopian tubes, leading to infertility.

It’s important to note that these are just some of the potential causes of infertility, and each individual’s situation is unique.