Dr. John Kinler Lees MD

The sinuses are four interconnected hollow spaces within the cranial bones of the face. These airy cavities exist as mirror opposites on either side of the nose and under the forehead. They are lined with mucus-secreting epithelium and thin hair-like growths called cilia. Acute infection,...

Oesophageal thrush is a yeast infection of the throat. It is also known as oral candidiasis or oropharyngeal candidiasis. A healthy person is unlikely to develop this condition. It affects only those with a weakened immune system such as patients with HIV, cancer, and those on immunosuppressive...

Nausea is a very unpleasant condition that is known as a feeling of sickness or uneasiness. Nausea is often a precursor to vomiting, and nearly everyone suffers from nausea at some point. Nausea can have a variety of different causes such as food poisoning, dehydration, motion sickness, morning...

IntroductionNicotine is an alkaloid stimulant that comes from the nightshade family of plants, particularly from the leaves of tobacco. The type of nicotine found in tobacco plants is called Nicotiana tabacum. Nicotine can also be synthetically produced. Thousands of chemicals are contained in...

One of the most common reasons why people visit their doctor is their back pain. According to the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), 8 out of 10 people have some type of back pain. The pain originates in the spine and can manifest in multiple forms. The...

What is zinc?Zinc is a mineral that plays an important role in many different chemical reactions in your body. The human body uses this mineral to fight off infections, maintain acid-base balance, promote growth and development, boost antioxidant activity, and regulate gene expression, among...