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How do you know if someone has the flu or COVID-19? What are the differences between these two illnesses? Here's what you need to know.

A deep vein thrombosis (DVT) is a blood clot in a large vein deep in your leg, arm, or elsewhere in the body. The clot can separate from the vein, travel to the lungs and cut off blood flow. This is a pulmonary embolism (PE). Pulmonary embolism is very serious and may cause death.

An emergency means you could die if you don't get care quickly. Or you could be hurt permanently. Read below to know when to use, and when not to use, an emergency room.

Although there are several types of headaches, migraine and tension headaches affect the most people. When you have a headache, it isn't your brain that's hurting. Irritated nerves send pain signals to the brain, which identifies where you hurt and how bad the pain is.

E-cigarettes are devices that allow users to breath in liquid that has nicotine in it. New health concerns have been raised about these devices. Here's what you need to know.

How long you stay in the hospital after open-heart surgery depends on what type of surgery you had and your needs. It may be as short as 3 to 4 days. If you have complications, you may stay in the hospital several weeks or longer.

After gastric bypass surgery, you will need to learn a new way to eat and drink. Your new stomach pouch is much smaller than it was before. And it has a small opening at the bottom called a stoma. This can become blocked by food if you aren't careful. Here are guidelines.

Radical orchiectomy is surgery to remove a testicle. It's most often done to treat testicular cancer. Or it may be needed if a testicle is severely damaged due to infection or injury. Some forms of treatment for prostate cancer include orchiectomy. Learn more about this procedure.

You just had a procedure to remove a lump or a small piece of tissue from your breast. After surgery, be sure to have an adult drive you home. Ask your doctor when you will get the results of the biopsy.