Benign adrenal tumors are masses that aren’t cancer. They form in the adrenal glands. The adrenal glands are part of the endocrine system. These glands make hormones that send messages to nearly every organ and tissue in the body. There are two adrenal glands, one above each kidney. Each gland has two types of tissue: the cortex and the medulla. …

Adrenoleukodystrophy (ALD) is one of a group of genetic disorders called leukodystrophies. ALD affects the nervous system and the adrenal glands. ALD is a progressive disease. Treatments aim to slow the progression and improve people’s quality of life.

Adult-onset Still’s disease (AOSD) is a rare type of inflammatory arthritis that affects your whole body. It causes joint and muscle pain, a daily fever and a rash. It can also cause other systemic (whole-body) symptoms. AOSD is an adult form of juvenile Still’s disease (juvenile idiopathic arthritis, JIA). It typically occurs in younger adults, between the ages of 16 and 35. …

Acute sinusitis is a short-term sinus infection (sinusitis). Acute sinusitis symptoms may last a week to 10 days and often go away without medical treatment. Home care and over-the-counter (OTC) decongestants help ease acute sinusitis symptoms.  

HIV stands for human immunodeficiency virus. HIV infects and destroys cells of your immune system, making it hard to fight off other diseases. When HIV has severely weakened your immune system, it can lead to acquired immunodeficiency syndrome (AIDS). Because HIV works backward to insert its instructions into your DNA, it is called a retrovirus.

Hidradenitis suppurativa (HS) is a condition that causes painful, recurring boils in areas of your body with sweat glands. There isn’t a cure, but treatment can help manage symptoms and prevent new boils and scarring. Another name for HS is acne inversa.

Acne is a common skin condition where the pores of your skin clog. Pore blockages produce blackheads, whiteheads and other types of pimples. Pimples are pus-filled, sometimes painful, bumps on your skin. The medical term for acne is acne vulgaris.

Reflux (acid reflux) is when food from your baby’s stomach travels back up into their esophagus. This may lead to spitting up and/or vomiting. In most babies, acid reflux isn’t problematic. It happens because your baby’s digestive tract isn’t fully mature yet. Your baby might spit up a lot — even daily — but have no health issues. Healthcare providers call such babies “happy spitters.” …

Achalasia is a rare disorder in which your esophagus is unable to move food and liquids down into your stomach. Your esophagus is the muscular tube that transports food from your mouth to your stomach. At the area where your esophagus meets your stomach is a ring of muscle called the lower esophageal sphincter (LES). This muscle relaxes (opens) to …

This skin disorder results in light-brown-to-black spots. It often happens to otherwise healthy people, but in some cases, it may be a sign of an underlying condition. The markings look like a spot or stain that you might think you can scrub off. But washing will not remove acanthosis nigricans (AN).