Dr. John Constantine Gretes MD

Recommended Articles

• What is a Cluster Headache?

  Headaches that recur two to three times during a short period of time are known as cluster headaches. This may last for few weeks, to months. These headaches often occur after sleep and recur throughout the day. It usually appears during the same time of the year, or season of the year. It may...

• Is There an Early Diagnosis Possible in Hyperkalemia?

  The human body is made up of certain minerals, each of which has a role to play to ensure a smooth function of the body. The body is considered healthy and working to its best ability when the prescribed balance of these minerals is maintained. When these minerals are lower or higher than the...

• What Medical Conditions Are Associated with Blood in Urine?

  Introduction:Blood in urine is more often than not a sign that there is something amiss in the body. It may signal a minor infection that need not worry you, but it could also be pointing to something more serious that is still undetected. Even if you appear to be in reasonably good health, it is...

• Different Types of Physicians Explained

  Doctors or physicians are categorized according to different factors including medical specialties and subspecialties. Most doctors specialize in a specific area of medicine. This article provides a summary of the different types of doctors in the medical field. AllergistsAllergists are also...

• What Causes Lupus?

  Lupus is an autoimmune ailment. This means that instead of your body’s regular defense system attacking viruses and bacteria, it destroys healthy tissues. This causes swelling. Symptoms include extreme fatigue, hair loss, rashes, cognitive dysfunction, severe muscle and joint pain, ulcers in the...

• Why do Kidney Stones Form in Different Sizes?

  What are Kidney Stones?Kidney stones are concentrated minerals and acid salts which accumulate in the kidney or the urinary system as crystal structures or stones. They occur when our body lacks fluids required to dissolve minerals and salts present in the urine. Initially the stones will be small...