Asthma tends to run in families, but precisely how and why are not known. Asthma may be present with a variety of symptoms. There is a wide range in the severity of asthma. Some people may have mild cases and may need no medication between attacks. In other people, asthma can be quite severe, needing continuous medication and hospitalization.
Many people appear totally well between attacks.
Diagnosis of asthma can often be made by a doctor who performs a physical examination and asks the patient questions about his or her past health. The doctor may order laboratory tests to look for other conditions or to determine how severe the asthma is. These tests may include blood tests, x-rays, and lung function tests. If the doctor is able to examine a person during an asthma attack, medicine that relaxes the tightened airways and improves breathing can be given right then. In such a case, the doctor can be more sure that the person truly has asthma.