Dr. John Marshall Nelson M.D.

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• Is Hair Dye Safe?

  Dying one's hair is a common routine for men and women who experience changes in the color of their hair as they age. Although long-term safety of these products are not clear, there are some precautionary measures to be followed while using a dye.One should consider the following before dying his...

• Resistance Training Is Key for Flexibility

  A study presented at the American College of Sports Medicine's annual meeting in Baltimore has shown that resistance training also may be good in improving flexibility and strength. “According to the study, resistance training can improve the flexibility as well as or better than stretching," says...

• Vitamin D Deficiency Signs and Symptoms

  What is vitamin D?Vitamin D is an important element to building strong and healthy bones as well as good overall health. It is also a vital nutrient that makes sure that the brain, lungs, heart, and muscles function well.Vitamin D is a fat-soluble vitamin. The body can make its own vitamin D when...

• Is Yawning Contagious?

  Contagious yawning among total strangers is very rare, according to a new study. People are more likely to yawn when they see somebody yawning, if the other person is family member or friend. A recent study shows that yawning is a sign of social empathy and emotional bonds between family and...

• HIV: 5 Transmission Myths

  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...

• What Are the Symptoms of Urinary Tract Infections?

  Urinary tract infection, or UTI, is the infection of any part of the urinary tract, including kidneys, urinary bladder, urethra, and ureters (tubes connecting the kidneys to the bladder). The most common among them is the infection of bladder, which when treated immediately, can prevent infection of...