Venkateshwarlu ticks off the effects of overexposure: diarrhea, nausea, difficulty in breathing, convulsions, headaches and depression.

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That can be characterized by sort of an acute respiratory distress, such as difficulty in breathing, sweating, high temperature, and turning blue, basically, from lack of oxygen.

CNN: "The Secret Life of Germs" author Philip Tierno

The entry records that the deceased suffered for more than a year from "intermittent difficulty in breathing" and adds that he was bedridden and "totally paralyzed for two months" before his death.

NPR: Book Traces Family Suffering from Deadly Insomnia

Mr. Page's condition of vocal cord paralysis is caused when one or both of the vocal cords don't open and close correctly, resulting in difficulty speaking or breathing.

WSJ: Google CEO Larry Page Diagnosed With 'Vocal Cord Paralysis'

For three straight matches in Melbourne, Djokovic has had difficulty breathing (he has blamed allergies).

WSJ: Novak Djokovic vs. Rafael Nadal: A Fitting End to the Year of the Tiger

He came from the Kampong Cham province in central Cambodia and died after developing fever, coughing and difficulty breathing earlier this month.

CNN: Cambodia sees spike in bird flu deaths

It is important to mention that individuals that already have the flu who then become more ill during the duration of the illness, (difficulty breathing, or shortness of breath) need to seek medical attention immediately in an emergency department, as the risk of secondary pneumonia rises with an abrupt deterioration of your condition.

FORBES: 2013 Flu Season: How to Protect Yourself

Nelson Mandela is breathing without difficulty, South Africa's presidency has said, as he spends a third day in hospital with a lung infection.

BBC: Nelson Mandela breathing without difficulty - presidency