Infertility may be due to male or female factors. Causes of infertility in woman include ovarian factors, tubal factors, age-related factors, uterine problems, PCOS, endometriosis etc. Menstrual cycle can be affected by many factors, such as diet, emotional instability, excessive physical exercise, life-style, and stress responsible for creating an imbalance of the Doshas (control the activities of the body-Vata, Pitta and Kapha).
Male infertility is usually caused by problems that affect either sperm production or sperm transport which include varicocele, infections, ejaculation problems, tumours, hormone imbalances, defects of tubules that transport sperm etc.
In Ayurveda main cause of any abnormal function in body is agnimandya (vitiation of the digestive fire of body) & tridosha dushti (vitiation of three governing factors of body).