Dr. Stephen William Maddock M.D., PH.D.

What is an Erection Self-Test?An erection self-test is a test performed by a man to determine the presence and/or severity of erectile problems. This test is also called the NPT (Nocturnal Penile Tumescence) stamp test. Before having the test, it is important to ensure that you have not had alcohol...

Hepatitis B, also known as HBV, is a disease caused by the Hepatitis B virus. This virus interferes with liver functions and can cause pathological harm. Normally, the infected person can get rid of this virus, but very few cannot, and thus becomes chronically infected. This virus can be fatal,...

Arthritis is a chronic disorder that affects the musculoskeletal system. A person diagnosed with arthritis can have very uncomfortable pain in one or more than one joint in their body. Sometimes, arthritis may cause disability. Arthritis can also be caused by bacterial or viral infections,...

Types of VertigoWhen the world seems as though it is spinning, without cause, it is time to check with a doctor. There are two common forms of vertigo; central and peripheral....

A bruise is a skin injury in which the color of the skin changes due to the breakage of blood vessels under the skin. The affected skin becomes blue or black in color, as blood accumulates just under the surface of the skin, resulting in a raised area or bump. These bumps are painful and may take a...

What is Chickenpox?Chickenpox is a type of infection that typically affects young children and results in blisters on the skin. It is a viral condition caused by the chickenpox virus, which is known as the varicella-zoster virus. Chickenpox is a disease that is easily identified without a medical...