Dr. Daniel Nora Chan MD

IntroductionCyanosis is the medical term for a bluish discoloration of the skin, nails, toes, and mucous membranes. It is generally caused by low levels of oxygen in the blood. Normally, blood appears bright red when it is fully oxygenated. However, when blood does not have enough oxygen, it turns...

Shingles, also known as herpes zoster, is a disease that occurs due to the reappearance of the varicella-zoster virus, which is the causative agent of chickenpox. Shingles usually starts with a skin rash. These skin rashes occur either in the form of a band or a strip covering a small area on your...

What does a black stool indicate?A black or dark red-colored stool is called tarry or bloody stools. However, passing dark-colored stools is not always caused by serious problems. One of the most common causes of black stools is the consumption of iron supplements, particularly in people who have...

Chronic knee pain is a long-lasting pain in the knees that is associated with swelling and stiffness. Typically, a knee pain lasts for more than three months. There are several causes of chronic knee pain and this article will focus on its causes, symptoms, diagnosis, and treatment.What is...

What are inverted nipples?Inverted nipples, also called as nipple retraction, nipple inversion, or invaginated nipple, is a condition in which the nipples point inward instead of out. In some women, nipple retraction can be present at birth. In some cases, the condition may develop due to trauma or...

What is enuresis?Enuresis, also called nocturnal enuresis, is the medical term for bedwetting or urinating during sleep. Bedwetting is usually part of a child’s development. It is fairly common among children and is slightly more common in boys.Most children outgrow bedwetting without any...