Rare Diseases

Different types of rare diseases

What are Rare Diseases?

Rare Diseases are diseases that occur in less than 200,000 people in USA.

Although the definition and number vary from country to country, the basic concept is same, that is, a rare disease affects only a few people in a population. However, if we see the big picture, there are more than 7,000 rare diseases that affect about 25-30 million Americans (data source: NIH).


Rare diseases affecting mainly heart, blood vessels (arteries & veins) and blood cells.


Rare Diseases affecting gastrointestinal system organ and tissues such as mouth, esophagus, stomach, pancreas, liver, intestines, etc.


Rare Diseases affecting endocrine glands such as thyroid glad, pituitary gland, adrenal gland, pancreas, ovary, testis, etc.


Rare Diseases affecting integumentary systems and related exocrine glands, such as, skin, hair, nails, sweat glands, etc.

Immune & Lymph

Rare Diseases affecting immune system cells (T Cells, B Cells, Macrophages), lymphatic tissues and associated tissues.


Rare diseases affecting skeletal muscles, smooth muscles, cardiac muscles and other connective tissue supporting muscular system.

Nervous System

Rare diseases affecting central nervous system (brain and spinal cord) and peripheral nervous system.


Rare Diseases affecting urinary system organ and tissues such as kidney, urinary bladder, ureter, urethra.


Rare Diseases affecting human reproductive organ and tissues such as gonads (testis & ovary), uterus, Fallopian tube, cervix, genitals, etc.


Rare diseases affecting respiratory systems that include nose, pharynx, larynx, bronchi, trachea, lungs, etc.


Rare Diseases affecting bones, cartilage, ligaments, joints and related tissues.


Rare Diseases affecting multiple organs, such as some kind of cancers that affects many organs.

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