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).
Low blood sugar in diabetes can cause lightheadedness. Feeling lightheaded is also common among patients with the flu. A person can feel lightheaded after persistent vomiting and diarrhea. Lying down may help alleviate the sensation.