Breathing Difficulty (Dyspnea)

⚠️ Acute dyspnea is a medical emergency requiring immediate evaluation.

Progressive breathing difficulty can indicate ALS respiratory muscle weakness, lung cancer, pulmonary fibrosis from autoimmune disease, or heart failure. Respiratory failure is the primary cause of death in ALS.

Body System: Respiratory / Neuromuscular

Related Diseases

• ALS — Diaphragmatic weakness causes progressive respiratory failure — the leading cause of ALS mortality.
• Stage IV Cancer — Lung tumors, pleural effusions, and phrenic nerve involvement cause cancer-related dyspnea.

Related Compounds

• Riluzole
• Tofersen

Frequently Asked Questions

How does ALS affect breathing?

ALS weakens the diaphragm and intercostal muscles, initially causing nocturnal hypoventilation (morning headaches, fragmented sleep). Forced vital capacity (FVC) monitoring tracks decline. Non-invasive ventilation (NIV/BiPAP) improves survival by 7-12 months and quality of life. Early NIV initiation is recommended when FVC drops below 80%.