Dr. Keith A Greiner M.D.

Recommended Articles

• What Is Chronic Sinusitis: Symptoms, Causes, and Treatment

  IntroductionChronic sinusitis is the inflammation of the sinuses that tend to persist for 12 weeks or more, despite treatment attempts. Another term for chronic sinusitis is chronic rhinosinusitis, which causes mucus buildup due to an impaired drainage of the sinuses. People with chronic sinusitis...

• What is Lung Cancer? Get the Facts

  The Nature of Cancerous CellsEvery cell in the human body is programmed to carry out a specific role. For example, a red blood cell carries oxygen to tissues, a white blood cell wards off infection, and an intestinal cell absorbs nutrients in the digestive tract. All these cells are programmed to...

• Blood Blister: Causes, Symptoms, and Treatment

  What is a blood blister?A blood blister is a raised piece of skin that has blood inside it. Blood blisters are somewhat similar to blisters that have clear fluid in them. The blisters are usually harmless and tend to go away within a few weeks without treatment. A blood blister can contain blood,...

• 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...

• Lactose Intolerance: Get the Facts

  Lactose intolerance is a digestive problem where the body cannot digest the lactose present in milk and dairy products. Lactose is naturally occurring sugar found in dairy products. It is the main carbohydrate found in all types of milk.In a very small number of cases the production of lactase may...

• What Causes an Upper Back Pain?

  Any pain or discomfort in and around the shoulders and upper areas of your back is referred to as upper back pain. Pain may occur due to a strain or poor posture over a period of time, or as a result of sudden injury or trauma. In recent times, the use of computers has lead to an increase in upper...