Cerebrospinal fluid (CSF) lymphocytosis is a condition in which the number of lymphocytes— a type of white blood cell—in the fluid surrounding your brain and ...

Hashimoto encephalopathy (HE), also called steroid-responsive encephalopathy associated with autoimmune thyroiditis (SREAT), is a rare condition in which the ...

Harlequin syndrome is a rare nerve condition that causes one side of the face and sometimes the upper body to turn red and sweat while the other side remains ...

Harding’s disease, also known as Harding’s syndrome, is a rare overlap of Leber’s hereditary optic neuropathy (LHON) and a multiple sclerosis–like illness. ...

Hallucinogen Persisting Perception Disorder (HPPD) is a condition where people continue to see changes in vision long after taking a hallucinogenic drug. In ...

Hallermann–Streiff syndrome (HSS) is a very rare genetic disorder that affects the development of the skull, face, skin, hair, teeth, and eyes. People with HSS ...

Gyrate Atrophy of the Choroid and Retina is a rare, inherited eye disorder that causes progressive loss of vision. It is caused by a deficiency of the enzyme ...

Esophageal dysbiosis refers to an imbalance in the normal microbial community of the esophagus. Under healthy conditions, the esophageal mucosa hosts a diverse ...

Nasal dysbiosis happens when the tiny living creatures (microbes) that normally keep your nose healthy get out of balance. In very simple terms, your nose has ...

Urinary Dysbiosis refers to an imbalance in the naturally occurring microorganisms (the microbiome) within the urinary tract. For many years, urine was thought ...

Respiratory dysbiosis is an imbalance in the community of microorganisms that normally live in the airways and lungs. In a healthy respiratory tract, a diverse ...

Vaginal dysbiosis is a condition in which the natural balance of microorganisms in the vagina is disturbed, allowing harmful or opportunistic microbes to ...

Oral dysbiosis refers to an imbalance in the community of microorganisms (bacteria, fungi, viruses) that live in the mouth. In a healthy mouth, these microbes ...

Gut dysbiosis means that the tiny creatures living in your digestive tract—mostly bacteria, but also viruses and fungi—are out of balance. In a healthy gut, ...

Dysbiosis is when the balance of helpful and harmful microorganisms in your gut breaks down. Think of your digestive tract as a garden: you need more of the ...

Neuropsychiatric dysbiosis is a condition where the community of microorganisms living in your gut (the gut microbiota) becomes unbalanced, leading to problems ...

Metabolic dysbiosis refers to an imbalance in the body’s metabolic processes, often driven by disruptions in gut microbes, hormone signaling, or nutrient ...

Small Intestinal Bacterial Overgrowth, or SIBO, happens when too many bacteria—usually the kinds normally found in the colon—grow in the small intestine. Under ...

Functional dysbiosis is an imbalance in the normal functions of the gut microbiome. The gut microbiome is a diverse community of bacteria, viruses, fungi, and ...

Inflammatory dysbiosis is an imbalance in the community of microbes living in the gut—beneficial bacteria decline while harmful species flourish—triggering ...