This document discusses tuberculosis (TB), a bacterial infection that mainly affects the lungs but can affect other parts of the body as well. TB is caused by the bacterium Mycobacterium tuberculosis, which is spread through the air. Symptoms of active TB infection include a bad cough, chest pain, weight loss, chills, and fever. Treatment requires taking medication for at least six to nine months, and it can take weeks after starting treatment to start feeling better, though symptoms may persist. Complications from TB treatment can include skin rashes, itchy skin, dark urine, and yellow skin or eyes.