Under Perens' definition, open source describes a broad general type of software license that makes source code available to the general public with relaxed or non-existent copyright restrictions.
1 Illnesses such as the flu or colds. Home treatment of your flu and cold symptoms usually will relieve lightheadedness. 2  Vomiting, diarrhea, fevers, and other illnesses that cause dehydration.  Very deep or rapid breathing (hyperventilation).
1 Allergies. 2  Illnesses such as the flu or colds. 3  Home treatment of your flu and cold symptoms usually will relieve lightheadedness. 4  Vomiting, diarrhea, fevers, and other illnesses that cause dehydration. 5  Very deep or rapid breathing (hyperventilation). 6  Anxiety and stress. 7  The use of tobacco, alcohol, or illegal drugs.