There are many possible causes of feeling faint and dizzy so it will be good to seek the help of a medical doctor for a proper medical evaluation. Blood tests would also be required.
Reasons why you are feeling faint or dizzy
Here is a list of some of the common conditions that I have encountered in my years of experience as a doctor:
Dehydration. When a person does not drink enough fluids, the blood pressure goes down. As a result, there is a lack of oxygen supply to the brain and a person would feel dizzy. A decrease in blood volume may cause inadequate blood flow to the brain or inner ear.
Anemia- where there is a lack of supply of healthy blood cells to the organs of the body resulting in dizziness.
Ear problems. Our sense of balance depends on the combined input from the various parts of our sensory system. These include our eyes, which help us to determine where our body is in space and how it is moving, sensory nerves, which send messages to our brain about body movements and positions, and inner ear, which houses sensors that help detect gravity and back-and-forth motion.
low blood sugar. It causes malfunctioning of the nervous system and dizziness appears.
Anxiety, stress, hyperventilation (over-breathing), depression, all can cause dizziness and giddiness. Hyperventilation results in reduced carbon dioxide in the blood. However, the oxygen quantity remains almost the same. Reduction in carbon dioxide causes respiratory alkalosis. So an abnormal reduction of the carbon dioxide in the blood vessels taking blood to the brain causes those vessels to constrict, resulting in lesser blood supply to the brain.
A drop in blood pressure in relation to changes in posture. A dramatic drop in our systolic blood pressure — the higher number in our blood pressure reading — may result in brief lightheadedness or a feeling of faintness. It can occur after sitting up or standing too quickly. This condition is also called orthostatic hypotension.
Patients who are underweight and those who have anorexia nervosa.
Heart disease. Conditions such as cardiomyopathy, heart attack, and heart arrhythmia could cause dizziness as these are conditions associated with poor blood circulation.
Pregnancy. Some women start to feel dizzy and nauseous early in the first trimester from about six weeks. In the second and third trimesters, the growing womb can exert pressure on the blood vessels, causing dizziness.
Other brain diseases like stroke, Parkinson’s disease and dementia.
