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).
Nonspecific causes. 1  The following things can cause lightheadedness, feeling giddy, or dizzy (not a spinning sensation like vertigo): 2  Hyperventilation or breathing too fast, usually unconsciously, may cause a sensation of lightheadedness. 3  Anxiety or panic disorders may be associated with dizziness.