Dr. David Olyn Hollis M.D.

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• What Are Roundworms?

  What are roundworms?Roundworms are a type of parasitic worms that infect the human intestine. Roundworms may vary and size and have a characteristic long, round body. These parasitic worms can cause a number of health problems in humans. They can enter the human body through the mouth and direct...

• What Could Lightheadedness Mean?

  What is Lightheadedness?Older adults commonly complain about feeling woozy, lightheaded, or a little faint.The reason may not be something dangerous, but still, if you feel lightheaded, it is better to be careful. Serious injuries due to a fall can result due to lightheadedness even though there...

• What Causes Swollen Ankles and Feet?

  Swelling of the ankles and feet are a common everyday experience. Either you or a loved one may have experienced ankle swelling at some point of your lives. It is that common and is not a usual cause for concern, especially if you have been standing or walking for a long period of time. However,...

• What Is Hormone Therapy?

  Hormone therapy is often used to relieve menopausal symptoms. However, since estrogen plays a crucial role in maintaining bone health, hormone therapy is another treatment option for osteoporosis.How does hormone therapy work?Following menopause, your body produces less estrogen and progesterone...

• Femoral Hernia: Get the Facts

  Our human bodies are a complex network of nerves, blood vessels, muscles, and visceral organs. While our skin is the outermost layer holding everything together, on the inside, it is a network of strong muscle fibers that hold all our internal organs in place. A hernia occurs when there is a weak...

• What Does Dark Stool Mean?

  A dark stool refers to a stool that is either black or dark red in color. You may pass dark bowel movements after consuming dark-colored foods or when an injury or bleeding is present in your gastrointestinal tract. If you pass dark or bloody stools, see your doctor immediately to rule out serious...