2. Postural Orthostatic Tachycardia Syndrome (POTS)
Have you ever stood up after lying down and felt weirdly dizzy? This is a sign of postural orthostatic tachycardia syndrome, otherwise known as POTS. POTS is a disorder that occurs because of orthostatic intolerance (OI). In other words, people with POTS become dizzy or faint when they stand up after lying down. This happens when an insufficient volume of blood returns to the heart after an individual stands up from a lying-down position, according to the National Institutes of Health (NIH). Fainting and lightheadedness are the main symptoms associated with this condition. POTS sufferers are known to experience a quick heartbeat -- an increase of more than 30 beats a minute or a heart rate faster than 120 beats per minute within 10 minutes of standing up is typical, according to the NIH.

Though POTS can strike anyone, experts say that nearly 80 percent of those with this condition are women between the ages of 15 and 50. Symptoms of POTS may occur just before menstruation. POTS can also begin post-pregnancy or post-surgery or after suffering trauma or being infected with a virus. It is also important to note that exercise may bring on POTS symptoms. Those in the medical field say symptoms of POTS usually subside once an individual lies down. That said, even if symptoms subside upon lying down, it’s still important to see a physician if symptoms of this condition are present.

3. Low Blood Sugar
Low blood sugar can be frustrating. Also called hypoglycemia, it can cause excessive dizziness that makes sufferers feel faint. According to the American Diabetes Association (ADA), hypoglycemia occurs with abnormally low blood glucose (blood sugar) levels, usually less than 70 mg/dl. For those who are diabetic, hypoglycemia is often called insulin reaction or insulin shock. The ADA says severe hypoglycemia has the potential to cause accidents, injuries, coma and death. Symptoms of hypoglycemia usually happen quickly and include shakiness, nervousness, anxiety, sweating, chills, clamminess, irritability, confusion, rapid heartbeat, hunger, nausea, blurred vision, tingling sensations, weakness, a lack of coordination, dizziness and seizures. Severe hypoglycemia can result in fainting and unconsciousness. For hypoglycemia, the ADA recommends consuming 15 to 20 grams of simple carbohydrates or glucose. Examples include 2 tablespoons of raisins, a half a cup of juice or regular soda, or even a glass of 1 percent milk. Diabetics should check blood glucose 15 minutes later. If blood sugar is still low, repeat this process. Eat a small snack if it’s going to be awhile before the next meal.