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People with COVID-19 generally develop signs and symptoms, including mild respiratory symptoms and fever, on an average of 5-6 days after infection (mean incubation period 5-6 days, range 1-14 days). Most people infected with COVID-19 virus have mild disease and recover.

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This means the muscle will be starved of the oxygen it needs to survive. This causes pain but can also lead to feeling short of breath. Without rapid treatment, part of the heart muscle can die, making the heart less effective at pumping blood and increasing the risk of breathlessness and heart failure.

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Tobacco smoke causes reduced lung function and breathlessness due to the swelling of airways and build-up of mucus in the lungs. The immediate respiratory symptoms are just part of the damage tobacco does to the lungs.

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Asthma affects the airways (the tubes that carry air in and out of the lungs). These become swollen and narrowed in asthma by inflammation, constriction or tightening of the smooth muscle in the bronchioles, and mucous plugging. These mechanisms cause many issues from coughing to trouble breathing.

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Pneumonia is an infection that inflames the air sacs in one or both lungs. The air sacs may fill with fluid or pus (purulent material), causing cough with phlegm or pus, fever, chills, and difficulty breathing. A variety of organisms, including bacteria, viruses and fungi, can cause pneumonia.

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Chronic obstructive pulmonary disease (COPD) is a chronic inflammatory lung disease that causes obstructed airflow from the lungs. Symptoms include breathing difficulty, cough, mucus (sputum) production and wheezing. It's typically caused by long-term exposure to irritating gases or particulate matter, most often from cigarette smoke. People with COPD are at increased risk of developing heart disease, lung cancer and a variety of other conditions.

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Having severe difficulty in breathing of a constricted or obstructed or lack of air.

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Drowning is a respiratory impairment resulting from hypoxia due to protracted submersion/immersion of the bare mouth and nose (as opposed to "wrapped in plastic or duct tape") in a liquid, usually water.

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Chronic bronchitis occurs when the lining of the bronchial tubes repeatedly becomes irritated and inflamed. The continuous irritation and swelling can damage the airways and cause a buildup of sticky mucus, making it difficult for air to move through the lungs.