Mood disorders include depressive disorders and bipolar disorders. These types of psychiatric disorders affect a person’s emotions and may cause severe lows, called depression, and highs, called mania ...

Guillain-Barré syndrome (GBS) is a rare nerve disorder that can occur after an infection. It develops due to an overreaction of the immune system. There are several types of GBS. Guillain-Barré ...

Medically reviewed by Kelly Wood, MD Endocrine disorders happen when hormone levels are too high or too low. Fatigue and mood ...

Paraneoplastic syndromes are a group of symptoms that happen in some people who have small-cell lung cancer (SCLC). Some paraneoplastic syndromes affect your nervous system, including your brain, ...

Multiple sclerosis (MS) is a chronic, often disabling condition that affects the central nervous system, disrupting communication between the brain and body. It’s largely thought to occur when the ...

Irritable bowel syndrome (IBS) is a chronic gastrointestinal disorder that causes symptoms like abdominal pain, bloating, and ...

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Myeloproliferative neoplasms are blood cancers that affect myeloid stem cells. Treatment can involve targeted medications or careful monitoring. Myeloproliferative disorders are a group of cancers ...

Sanfilippo syndrome, also known as mucopolysaccharidosis type III, is a rare life-threatening disorder that interferes with metabolism. While it doesn’t have a cure, some symptoms can be treated to ...