There's 5 Stages of Tuberculosis : 1. Onset (1-7 Days) : The bacteria is inhaled
2. Symbiosis (7-21 Days) : If the bacteria does not get killed then it reproduces
3.Initial Caseous Necrosis (14-21 Days) : Tuberculosis starts to develop when the bacteria slows down at reproducing, they kill the surrounding non-activated macrophages and run out of cells to divide in. The bacteria then produces anoxic conditions and reduces the pH. The bacteria can't reproduce anymore but can live for a long time.
4.Interplay of Tissue-Damaging and Macrophage Activating Immune Response (After 21 days) : Macrohpages surround the tubercule but some may be inactive. Tuberculosis then uses it to reproduce which causes it to grow. The turbecule can break off and spread around. If it spreads in the blood you can develop tuberculosis outside the lungs, this is called Miliary Tuberculosis.
5. Liquification and Cavity Formation : The tubercules at one point will liquify, which will make the disease spread faster, not everyone will get to this stage. Only a small percent of people will get to this stage.