Causes of lightheadedness include deep or rapid breathing, vomiting, fever, and allergies, states WebMD. Excessive physical activity, alcohol use, lack of sleep and unhealthy eating habits can cause fatigue, according to Mayo Clinic.
Lightheadedness is a condition in which a person feels dizzy or has a fainting spell or syncope, notes WebMD. This condition is common to people with low blood pressure due to an insufficient supply of oxygenated blood to the brain. In severe cases, a person may pass out, and this condition may worsen when changing position from standing up, sitting or lying down, explains MedicineNet.
Fatigue is a lack of energy and an overall feeling of tiredness. Periods of emotional stress, taking antidepressants and conditions such as anemia, insomnia and diabetes can lead to fatigue, explains Healthline. Additionally, bleeding in the digestive tract can cause lightheadedness and fatigue, and this bleeding can occur for days or weeks without a person noticing, notes WebMD. Other causes include an abnormal heart rhythm and heavy menstrual bleeding.
Fatigue is a common symptom of conditions such as stress, anxiety and depression, says Mayo Clinic. Patients should seek immediate attention if severe headache, bleeding from the rectum, chest pain and shortness of breath accompany fatigue.