Treatment of TB does not lead to infertility. The disease TB itself may lead to TB depending upon which organs are involved by the tubercular lesions. However, please take into consideration the following facts: 1. India is having second largest popullation in the world with high birth rate. 2. India is having very high incidence of Tuberculosis - Mostly Pulmonary (of the lungs) but even extrapulmonary (outside the lungs) also. Thus we cannot say that Tuberculosis everytime affects the fertility. If the Tuberculosis has affected the genital organs - particularly uterus, tubes, ovaries and cervix, it definately causes infertility. This infertility in majority of the cases cannot be reverted even after sucessful treatment as the damage to functions the organs cannot be reverted. The other and in particular Pulmonary tuberculosis is not shown to affect the fertility unless it has advaced so much as to endanger the life of the patient. In fact the rule of the nature is that whenever there is risk to the life, the first system to be jeopardize is rerpoductory system Of course if any complications of the antitubercular medicines have occured which affect the lining of the uterus or tubes, it may damage them resulting into infertility. Whether such damage has occured can be known by your gynaecologist only after visualising these tissues by x-ray, ultrasonography or hysteroscopy (telescopic examination).