First-generation antihistamines are older allergy medicines that relieve itching and swelling but often cause drowsiness because they cross into the brain. They're less commonly used today for daily urticaria control than newer options. Doctors sometimes still choose them for short-term or nighttime symptom relief.

FEV1 means "forced expiratory volume"; how much air you can force out in the first second. This term describes an important change in the lungs or airways. Understanding it can help explain symptoms such as breathlessness, mucus build-up, or repeated infections. It also supports doctors in monitoring the condition and adjusting treatment.

FVC means "forced vital capacity"; the total amount of air you can breathe out after a deep breath. This term describes an important change in the lungs or airways. Understanding it can help explain symptoms such as breathlessness, mucus build-up, or repeated infections. It also supports doctors in monitoring the condition and adjusting treatment.

FEV1/FVC Ratio means the "math" doctors use to diagnose copd; a ratio under 70% usually confirms it. This term describes an important change in the lungs or airways. Understanding it can help explain symptoms such as breathlessness, mucus build-up, or repeated infections. It also supports doctors in monitoring the condition and adjusting treatment.

Fatigue means total body exhaustion caused by the extra work of breathing and low oxygen. This term describes an important change in the lungs or airways. Understanding it can help explain symptoms such as breathlessness, mucus build-up, or repeated infections. It also supports doctors in monitoring the condition and adjusting treatment.