Any dysfunction related to ovulation,ovum transfer,sperm migration,fertilization and implantation can cause infertility.

• Anatomical---like cervical stenosis,cervicitis,endometrial   polyp/fibroid/septum,blocked tube,large ovarian cyst/endometriosis etc

• Hormonal---ovulatory defects/polycystic ovaries/hypothyroid/hyperthyroid etc

• Systemic----obesity,chronic diseases like DM,HT etc

• Life style disorders---stress,use of tobacco,alcoholand recreational drugs,excessive exercise,exposure to chemicals etc