Step 1: Tuberculosis of the endometrium is part of female genital TB, which characteristically descends from infected tubes after haematogenous seeding from a primary site such as the lung.
Step 2: Among all the ways this disease announces itself, the inability to conceive is the dominant presentation, seen in roughly one third to two thirds of affected women, so the answer is infertility.
Step 3: The fertility failure stems from tubal scarring and occlusion, and from an endometrium so damaged that even open tubes cannot support a pregnancy.
Step 4: Pain, scanty or absent periods and abnormal discharge are recognised features but appear less often, so they rank below infertility as the chief complaint.
\[\boxed{\text{Infertility}}\]