A condition in which a person's airways become inflamed, narrow and swell and produce extra mucus, which makes it difficult to breathe. A lot of people are affected by this allergy. According to the Centers for Disease Control and Prevention (CThere’s no way to know how pregnancy will affect asthma. Some expecting mothers don’t experience a change. For others, their pregnancy may make their asthma better or even worse. If symptoms worsen, it’s more likely to happen in your second and third.trimesters.DC), approximately 27 million americans have asthma. It’s the most common chronic condition among American children: 1 out of 12 child has asthma. Asthma is a long-term problem in the tubes that carry air into your lungs that can make it hard for you to breathe. These airways get so narrow that air can't move freely. It can cause serious wheezing and breathlessness, known as asthma attacks. There's no cure, but most people can control their symptoms.Asthma is a chronic airway condition that leads to wheezing and difficulty breathing. Learn more about the types and causes of asthma here. When you do have asthma symptoms, you may feel like you are breathing through a straw. You may also hear wheezing (a whistling or squeaking sound) as air . Asthamic people have issues with high altitudes and cold weather, sympyoms can recur.