If you have a left-sided headache, you may wonder if it could be due to something serious. Headaches are very common. More than 90 percent are primary headaches, meaning they are not due to an underlying brain disease or injury.

According to the National Headache Foundation, about 29.5 million people in American suffer from migraine symptoms, including soreness in the temples. Temple soreness can be painful and debilitating, interfering with daily activities and relationships.

A migraine headache is often felt as a throbbing and pulsating pain on an area of the head that may be accompanied by nausea, vomiting or sensitivity to light and sound, according to the National Institute of Neurological Disorders and Stroke.

The many common causes of temple headaches range from tension-type headaches to migraines, and even dental problems. Headache pain at the temples can also occur after a concussion. Other serious causes, such as meningitis and tumors, can produce temple headaches, but they tend to produce other symptoms as well.

Some but not all studies have reported that certain dairy products can trigger headaches or migraines.

Urinary tract infections are the second most common type of infection, according to the National Kidney and Urologic Diseases Information Clearinghouse, accounting for roughly 8.3 million doctor visits every year. They develop when bacteria clings to your urethra -- the tube that carries urine out of your body.

Millions of people suffer from headaches. There are many types including, migraine, cluster, and tension or stress headaches. Most can be treated and controlled, but some headaches are caused by more serious problems like brain tumors.

That uncomfortable swollen sensation in your abdomen known as bloating is one of the most common symptoms of intestinal gas, according to the National Digestive Diseases Information Clearinghouse.

High cholesterol itself usually does not cause any symptoms, including headaches or dizziness. But elevated levels of cholesterol can indirectly produce symptoms, especially the so-called bad cholesterol known as low-density lipoprotein cholesterol (LDL-C).

Headaches begin due to various causes. Some individuals experience a headache every once in awhile, while others suffer from frequent, sometimes daily, painful headaches. The frequency of recurring headaches may be reduced if sufferers can target the specific causes of their headaches.

"The Merck Manual Home Health Handbook" describes iron deficiency as one of the most frequent mineral deficiencies in the world. It leads to anemia, a condition that develops when your body does not produce enough healthy red blood cells to supply your organs adequately with oxygen.

A sudden headache over one of your eyes during exercise can prevent you from continuing your workout. The pain can last anywhere from just a few minutes to several days.