When Recurring Respiratory Symptoms Could be the Sign of a Chronic Lung Condition Dec. 21, 2020 FacebookTwitterEmail (BPT) - Living with a chronic lung condition can be challenging. The first step toward improving your lung health is understanding what kind of lung condition you have and what you can do to manage your condition in close partnership with your doctor. One such condition, Mycobacterium avium complex (MAC) lung disease, can be serious and can worsen over time. Commonly found in the environment, MAC bacteria is the most common species that causes nontuberculous mycobacterial (NTM) lung disease. MAC bacteria can get inside your lungs when you breathe them in through daily activities, such as showering or gardening. While most people who come in contact with MAC do not develop an infection, people at risk are those with other lung conditions such as