Dr. Mark C. Shields M.D.

Introduction An average man ejaculates 1/2 teaspoon to 1 teaspoon of semen. This small amount of semen contains millions of sperm cells. It only takes one sperm to fertilize an egg, but each sperm has a limited life span, which begins once it leaves a man's body.For a couple trying to have a baby,...

What is Raynaud’s disease?Raynaud’s disease, also known as Raynaud’s syndrome or Raynaud’s phenomenon, is a rare blood vessel disorder described by a French physician named Maurice Raynaud in 1862. In this condition, the blood vessels that carry blood from the heart to other parts of the...

Want a youthful appearance? Then just smile, or so says a new study. In one recent study, people guessed that people who were smiling in photos were younger than those who had neutral or angry expressions. This is another study which adds to the evidence that facial expression has an impact on the...

Foot or ankle swelling is called edema. Many things, including high blood pressure and pregnancy, can cause this problem. Edema in your feet and ankles occurs when your body is unable to push blood and fluids in them up your legs, so that your ankles and feet swell. Swelling in the feet and ankles...

Diabetes comes with a lot of signs, so it is important to recognize the signs and symptoms before it is too late. It's important to see your doctor before the symptoms become severe. Type 2 diabetes symptoms often develop slowly and most people don’t even know it. It is really important to get a...

The liver primarily produces cholesterol. Each day, it makes 1,000 mg of cholesterol. The cells lining the small intestine can also produce cholesterol. If the level of cholesterol in the body is low, it may mean that the body is producing low amounts of cholesterol and is going to shut down. In...