Dr. Daniel J Hirsen M.D.

What is HIV?HIV is a virus that was discovered in the 1980s. It attacks a person's immune system, causing it to be too weak to fight outside infections. The HIV virus works by destroying white blood cells, called CD4 cells, in the immune system, and progresses through three stages, the last of which...

The impaired ability to digest lactose is called lactose intolerance. Lactose is a sugar found in milk and dairy products. Digestion breaks lactose down into two simple sugars called lactase, which is an enzyme found in the small intestine. If there is an insufficient production of this enzyme,...

Muscular dystrophy is a category of muscle diseases that cause progressive weakness and loss of muscle mass.  Muscular dystrophy (MD) is either inherited or can be due to a genetic mutation. Kids with MD usually follow a normal pattern of growth development in the first few years of their lives,...

IntroductionAlthough doctors have the best intentions, it does not always mean that they will perfectly recognize their patient’s greatest need. For this reason, patients also need to take an active role when it comes to communicating with their doctor.One of the best ways to make sure that...

Introduction Pyrexia is the medical term for fever, in which the human body temperature rises above the average normal (37 degrees Celsius or 98.6 degrees Fahrenheit). Pyrexia is one of the most common symptoms of numerous medical conditions.There are multiple factors can affect the normal body...

What is anemia?Anemia occurs when there are low levels of red blood cells (RBCs) in the body. Red blood cells are the ones that carry oxygen all over the body. So when a person's RBC count is lower than normal, it means that there is not enough oxygen in the blood, causing symptoms of anemia, such...