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Asthma
Asthma is a chronic lung disease. Common symptoms are wheezing, coughing, chest tightness, and shortness of breath. During an asthma attack, the sides of the airways in lungs swell and the airways shrink, making it harder to breathe.
Featured Topics
Below is a list of popular health topics at NIEHS.
Air Pollution and Your Health
Endocrine Disruptors
Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS)
Autoimmune Diseases
Toxicology
Autism
Inflammation
Electric & Magnetic Fields
Environmental Health Topics A-Z
Acrylamide
Agricultural Health
Air Pollution and Your Health
Algal Blooms
Allergens
Aloe Vera
Alternatives to Animal Testing
Arsenic
Asthma
Autism
Autoimmune Diseases
Biomarkers
Bisphenol A (BPA)
Breast Cancer
Cell Phone Radio Frequency Radiation
Chemical Mixtures
Children's Environmental Health
Cosmetics and Your Health
Dioxins
Dust Mites and Cockroaches
Electric & Magnetic Fields
Emergency Response
Endocrine Disruptors
Epigenetics
Essential Oils
Exposure Science
Flame Retardants
Formaldehyde
Gene and Environment Interaction
Hazardous Material/Waste
Hexavalent Chromium
Hydraulic Fracturing & Health
Indoor Air Quality
Inflammation
Kidney Disease
Lead
Lung Diseases
Mercury
Microbiome
Mold
Nanomaterials
Native American Health and the Environment
Nutrition, Health, and Your Environment
Obesity
Parkinson's Disease
Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS)
Pesticides
Pet Allergens
Pollen
Radon
Reproductive Health
Safe Water and Your Health
Smoking and Vaping
Styrene
Toxicology
Weather Extremes
Women's Health and the Environment
Workers' Health
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Last Reviewed: April 22, 2026