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).
1 If you are over the age of 65 years, you are more likely to have a medical condition or take medications that causes lightheadedness. 2  Medications including drugs to lower blood pressure or pain, prevent seizures, sedatives and tranquilizers can cause lightheadedness.