Dr. John C Greenawalt M.D.

What Is Heat Rash?Heat rash is a condition of the skin that results from a blockage of the sweat ducts. This condition can be attributed mostly to excess sweating, and is therefore very common in hot and humid areas. All people can be affected by heat rash, especially if they are in conditions that...

Causes of Gastrointestinal Tract and Rectal BleedingHemorrhoids (Piles)Hemorrhoids are probably the most common cause of blood in the stool. These are swellings in the lower rectum (lower back passage) and anus. Inside the lining of the lower rectum and anus is a group of small blood vessels known...

What Is Atelectasis?Atelectasis is a complete or partial collapse of the lung or lobe of a lung. This medical condition develops when the tiny sacs, known as alveoli, present within the lung become deflated.This is a breathing complication which often occurs after surgery. Apart from surgery, it is...

Systemic lupus erythematosus (SLE) or simply lupus is a chronic autoimmune disease characterized by the immune system going into overdrive and attacking antigens and healthy tissue alike. This leads to inflammation affecting multiple organs like the kidneys, heart, lungs, and brain and also causing...

Enlarged heart or cardiomegaly is an indication of an underlying condition rather than a disease in itself. Enlargement makes the heart work harder than normal and weakens the heart muscles after a period of time. An enlarged heart has a number of causes including hypertension and coronary artery...

Sepsis is a serious medical condition characterized by an exaggerated immune response towards an infection. This response causes the release of chemicals, which results in widespread inflammation and blood clotting in different parts of the body. Sepsis may result in sudden drop in the blood...