Explore rare diseases in clinical trials
Check which rare diseases are currently being frequently studied.
See also our popular diseases glossary and drug database.
Starting by letter
To open the rare diseases glossary, select a letter from the list below.
Rare diseases starting with “g”
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Gastrointestinal stromal tumour
Gastrointestinal stromal tumours are rare cancerous growths that develop in the digestive system, most commonly in the stomach or small intestine, and can range from very small to large masses that cause serious symptoms.
- 4
Gaucher’s disease type I
Gaucher’s disease type I is the most common form of this rare genetic disorder, affecting approximately 95% of cases in western countries and being the most prevalent Jewish genetic disorder. While it causes symptoms ranging from enlarged organs and bone pain to bleeding problems, effective treatments are available that can help patients live full, active lives well into old age.
- 3
Gaucher’s disease type III
Gaucher’s disease type III is a rare inherited condition where the body cannot properly break down fatty substances, leading to progressive problems affecting the brain, bones, and major organs throughout life.
- 2
Glomerulonephritis membranoproliferative
Membranoproliferative glomerulonephritis is an uncommon kidney disorder that involves inflammation and damage to the tiny filters in your kidneys, potentially leading to serious kidney problems and requiring ongoing medical care.
- 4
Glomerulonephritis membranous
Membranous glomerulonephritis is a kidney disease where your immune system mistakenly attacks the tiny filters in your kidneys, causing protein to leak into your urine and potentially leading to serious complications if left untreated.
- 0
Glomerulonephritis rapidly progressive
Rapidly progressive glomerulonephritis is a serious kidney condition that can damage your kidneys in just days to weeks. Without early diagnosis and treatment, it can lead to permanent kidney failure.
- 1
Glycogen storage disease type I
Glycogen storage disease type I is a rare inherited disorder that prevents the body from properly breaking down stored sugar, causing severe low blood sugar and serious health complications if left untreated.
- 5
Glycogen storage disease type II
Glycogen storage disease type II is a rare inherited condition that prevents the body from breaking down glycogen properly, leading to its buildup in cells and causing progressive muscle weakness, heart problems, and breathing difficulties that can be life-threatening without early treatment.
- 0
Glycogen storage disease type V
Glycogen storage disease type V is a rare inherited condition that affects how muscles use stored energy, causing fatigue, pain, and cramps during physical activity. While symptoms usually begin in childhood or young adulthood, many people aren’t diagnosed until decades later due to the condition often being misdiagnosed or overlooked.


