The National Institute of Dental and Craniofacial Research estimates that 500,000 Americans experience their first cold sore every year. For most, the first episode is also the last. A smaller number---between 20 and 40 percent--suffer recurrent episodes.

A tendon is a thick fibrous cord that attaches your muscles to your bones. You have tendons in your feet, ankles, elbows, shoulders and knees.

Cold sores are itchy, painful sores caused by infection with one of two types of the herpes simplex virus, usually type 1. The National Institute of Dental and Craniofacial Research estimates that at least 45 to 80 percent of Americans have contracted the virus, most before the age of 10.

A sore shoulder can be caused by bone spurs, cartilage or tendon tears, weakened muscles or tendon bursitis, according to Duke Health. By keeping your shoulders strong and mobile, you can manage shoulder soreness.

“Fitzpatrick’s Dermatology in General Medicine” explains that more than 90 percent of people eventually acquire the herpes simplex virus that causes cold sores. About 60 percent experience symptoms so mild that they go unrecognized as cold sores.

Cold sores, also known as fever blisters and herpes labialis, are painful, fluid-filled blisters that usually develop on the borders of the lips and, sometimes, other places on the face or inside the mouth. Cold sores result from infection with one of two types of the herpes simplex virus.

Throat swelling, or pharyngitis, can cause pain or itching in the throat that may worsen when you swallow. Most cases of throat swelling are caused by viral infections, such as the cold or flu, but if your symptoms are caused by a bacterial infection, antibiotics may be required.

The common cold typically causes symptoms such as runny nose and nasal congestion. Babies are very susceptible to contracting the common cold, particularly from older children who don’t always wash their hands. A baby’s immune system is also immature, which makes young children more susceptible.

Cold sores, often called fever blisters, usually occur on the lips or around the mouth. Caused by the herpes simplex virus, or HSV, and transmitted through skin contact with an infected person, this infection spreads easily.

Nearly everyone has suffered from cold symptoms at one time or another. In fact, about one billion colds occur each year in the U.S., according to the University of Pennsylvania Health System. The most common symptoms of this respiratory infection are nasal congestion, sneezing, sore throat, cough and headache.

A "cold" in a baby's eye is referred to as conjunctivitis. Your baby's conjunctiva is the membrane that lines her eyelids, and when it becomes inflamed or infected, your baby develops conjunctivitis.

Cold sores are caused by the herpes simplex virus. There are two types of the virus, type 1 and 2. Cold sores are typically the result of type 1, according to Medline Plus. These sores are painful and last a week or longer. The blisters occur on the lips, chin, nostrils and checks.