World PH Day, 05.05.2026. When Brigitte Kaufmann could no longer climb the stairs to her apartment or carry her child, something was clearly wrong. Yet her symptoms were dismissed and even mistaken for claustrophobia. It took years before she received the correct diagnosis: pulmonary arterial hypertension (PAH), a rare and progressive disease affecting the blood vessels in the lungs. Today, more than 40 years later, her story tells a different story: one of resilience, medical progress, and hope.
PAH gradually damages the small arteries in the lungs and can lead to severe heart complications if left untreated. It occurs in only about 50 out of every million adults, making it a rare disease. But rarity is only part of the challenge. For many patients, this means that valuable time is lost before treatment begins.