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).
Some prescription and over-the-counter medications can also cause lightheadedness. In some instances, lightheadedness is due to a more serious condition, including: 1  heart conditions, such as a heart attack or heart beating out of rhythm.  internal bleeding (in your internal organs or organ systems)