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 of the more common causes of lightheadedness include: dehydration from a viral infection, from nausea and vomiting, or from any other cause. using tobacco, alcohol, or illicit drugs. various prescription drugs. orthostatic hypotension. vasovagal episodes. dysautonomia. allergic reactions.