Cancer Pneumonia Flu Bacterial Infections Bronchitis Symptoms Respiratory Illnesses COVID-19 Infections Viral Infections Leukemia ALS Prostate Cancer Stroke Stomach Cancer Shingles Influenza Hospitalizations Covid-19 Undisclosed Illnesses Heat-related illnesses Short Illness Participants Falling Ill Lung Infection Child Health Gastrointestinal Infections Pulmonary Issues Life-threatening Illnesses Pancreatic Cancer Blood Cancer Reported Ill Health Long Covid Liver failure Bleeding in Stomach Post-9/11 Related Illnesses 9/11-Related Illnesses Intestinal Problems Stomach Bleeding Ulcers Auto-Immune Diseases Pulmonary Fibrosis Bacterial Infection Colds Gastrointestinal Illnesses Kidney Illness Respiratory Tract Inflammation Flu Symptoms Respiratory Inflammation Abdominal Surgery Colon Surgery Ocular Surgery Sciatica Viral Encephalitis Heart Surgery Cancers Lymphoma Heart Conditions Mental Illness Multiple Sclerosis Sepsis COVID-19 Exposure Lead Poisoning Fever Deaths Flu-like Symptoms Ménière's disease Gastrointestinal Issues Digestive System Prostate cancer Mysterious Illnesses CDC Investigation Investigations Cardiac Arrest Treatment Kidney Ailment Heat-related Illnesses Stomach Flu Lymphatic Cancer Chronic Illnesses Heat-Related Autoimmune Disorders Heart Disease Hypertension High Blood Pressure Kidney Failure Bowel Illness Gastrointestinal Disorders Ramsay Hunt Syndrome Short-term Illnesses Age-related Illnesses Dehydration