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).
Pneumonia, wherein infected air sacs in the lungs fill with fluid, is a leading complication of flu. Severe pneumonia can cause lightheadedness due to low blood pressure or too little oxygen in the blood. An inner ear infection, another possible complication of the flu, can lead to a spinning sensation and nausea.