When it comes to asthma and appetite, doctors and dietitians worry most about patients who eat too much, shun exercise for fear of becoming breathless, and end up being overweight.
But in a small minority of patients, poorly controlled asthma can leave them too breathless and fatigued to eat properly. Furthermore, a few asthma medications can cause upset stomachs or thrush infections in the mouth, leading to poor appetite.
American Academy of Allergy Asthma & Immunology: "What is an Allergy/Asthma Specialist?" American Academy of Family Physicians: "Asthma: Questions to Ask When It Doesn’t Get Better?" Merck Source: "Questions to Ask Your Doctor."