Mononucleosis, commonly called mono, is an infectious illness most often caused by the Epstein-Barr virus. It is sometimes referred to as the kissing disease because it spreads mainly through saliva. Mononucleosis is more common in teenagers and young adults, but it can affect people of all ages. The condition usually causes fatigue, fever, and sore throat, and symptoms can last …

Kidney stones are hard mineral and salt deposits that form inside the kidneys when urine becomes concentrated. This allows minerals to crystallize and stick together. Kidney stones can vary in size and may pass through the urinary tract unnoticed or cause severe pain when they move or block urine flow. The condition is common and can affect people of all …

A kidney infection, also known as pyelonephritis, is a serious type of urinary tract infection that affects one or both kidneys. It usually begins in the bladder or urethra and travels upward to the kidneys. Kidney infections require prompt medical treatment, as delayed care can lead to permanent kidney damage or life-threatening complications. Symptoms Symptoms of a kidney infection often …

Seborrheic keratosis is a common, noncancerous skin growth that typically appears in adults as they age. These growths develop on the outer layer of the skin and can vary in color from light tan to dark brown or black. They often have a waxy, scaly, or slightly raised appearance and may look as though they are stuck onto the skin. …

Overview Keratosis pilaris is a common, harmless skin condition that causes small, hard bumps on the skin’s surface. Often referred to as “chicken skin” due to its distinctive appearance, this condition occurs when keratin, a protein that protects skin from infections and harmful substances, builds up and blocks hair follicles. The result is rough patches of tiny bumps that typically …

Keratoconus is a progressive eye condition in which the normally round cornea becomes thin and bulges outward into a cone-like shape. This abnormal shape affects how light enters the eye, leading to distorted and blurred vision. Keratoconus often begins in adolescence or early adulthood and may worsen over time. Early diagnosis and proper management can help slow progression and preserve …

Keratitis is an inflammation of the cornea, the clear, dome-shaped surface that covers the front of the eye. It can be caused by infections or noninfectious factors and may range from mild to severe. Keratitis can affect one or both eyes and, if not treated promptly, may lead to vision impairment or permanent eye damage. Early diagnosis and appropriate treatment …

A keloid scar is an abnormal overgrowth of scar tissue that develops at the site of a skin injury. Unlike normal scars, keloids extend beyond the original wound boundaries and may continue to grow over time. They are benign but can cause cosmetic concerns, discomfort, or itching. Keloid scars can develop after minor skin injuries such as cuts, acne, piercings, …

Kawasaki disease is an acute inflammatory illness that primarily affects young children, usually under the age of five. It causes inflammation of blood vessels throughout the body and can lead to serious heart complications if not treated promptly. Kawasaki disease is one of the leading causes of acquired heart disease in children. Early diagnosis and treatment significantly reduce the risk …

Kaposi sarcoma is a rare type of cancer that develops from the cells lining blood vessels and lymphatic vessels. It most commonly appears as painless purple, red, or brown patches or nodules on the skin, but it can also affect internal organs such as the lungs, gastrointestinal tract, and lymph nodes. Kaposi sarcoma is closely associated with infection by human …