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Learn how diseases work
Before the research, the understanding. What each kind of disease is, why it happens, what it does to the body, why it is so hard to cure - and what research is trying now. Open any disease to see its own evidence.
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Cancer
Cells that grow out of control
What it is
Cancer is a group of diseases in which some of the body's cells grow and divide without control, and can spread to other parts of the body.
Changes (mutations) build up in the genes that tell a cell when to grow, divide and die.
Most of these changes happen during life: tobacco, too much sun, alcohol, some infections (such as HPV and hepatitis B and C), radiation, obesity and ageing all raise the risk.
Some people inherit a faulty gene that raises their risk, such as BRCA1 or BRCA2.
🫀 What it does to the body
Cancer cells form a lump (tumour) that can press on or invade nearby organs.
They can travel through the blood or lymph to start new tumours elsewhere (metastasis).
Blood cancers crowd out healthy blood cells in the bone marrow.
🧱 Why it is hard to cure
Every cancer is different, even between two people with the same type - and inside one tumour.
Cancer cells keep changing, so they can learn to resist a medicine that worked at first.
Cancer cells are the body's own cells, so killing them without harming healthy cells is hard.
Many cancers cause no symptoms until they have spread, and a new medicine often takes more than ten years to go from the lab to patients.
🚀 What research is trying now
Targeted medicines against the exact gene change in a tumour (for example EGFR, ALK or KRAS).
Immunotherapy that helps the immune system recognise cancer, including CAR-T cell therapy.
Personalised cancer vaccines built from each tumour's mutations, now in late trials.
Blood tests that look for tumour DNA to find cancer earlier, and AI to read scans and slides.
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Diabetes and metabolism
Sugar that cannot get into cells
What it is
In diabetes the body cannot make enough insulin, or cannot use it well, so sugar (glucose) stays too high in the blood instead of feeding the body's cells.
Insulin is like a key that opens cells to let sugar in. It is made in the pancreas.
Type 1: the immune system destroys the insulin-making cells, so there are almost no keys.
Type 2: the cells stop answering insulin well (insulin resistance) and the pancreas cannot keep up. Weight, inactivity, diet, family history and age raise the risk.
🫀 What it does to the body
Years of high blood sugar damage small and large blood vessels and nerves.
That can lead to heart attack and stroke, kidney failure, loss of eyesight, nerve pain and foot ulcers.
🧱 Why it is hard to cure
Type 1 cannot yet be prevented or reversed; people need insulin every day.
Type 2 can be silent for years before it is found.
Managing blood sugar is lifelong, and medicines, insulin and monitoring are not easy for everyone to get.
🚀 What research is trying now
GLP-1 medicines that lower blood sugar and weight, now also shown to protect the heart and kidneys.
A medicine that can delay type 1 diabetes in people at high risk (teplizumab, approved in the US).
Replacing insulin-making cells grown from stem cells, in clinical trials.
Automated insulin delivery ("artificial pancreas") systems that link a sensor to a pump.
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Heart and blood vessels
Arteries that narrow and clog
What it is
Heart and blood vessel (cardiovascular) diseases affect how blood flows. The most common is coronary artery disease, where the arteries that feed the heart become narrow.
A fatty plaque slowly builds up inside artery walls (atherosclerosis), over many years.
High LDL cholesterol, high blood pressure, smoking, diabetes, obesity, inactivity, family history and age all speed it up.
🫀 What it does to the body
Narrow arteries starve the heart muscle of oxygen, causing chest pain.
If a plaque breaks, a clot can block the artery completely: a heart attack - or a stroke in the brain.
A weakened heart may not pump well enough (heart failure).
🧱 Why it is hard to cure
Plaque builds silently for decades; the first sign can be a heart attack.
Heart muscle that dies does not grow back.
The risk factors are very common and need lifelong control.
🚀 What research is trying now
New ways to lower cholesterol, such as PCSK9-blocking medicines and twice-a-year injections.
Medicines against lipoprotein(a), an inherited risk factor, in late trials.
Gene editing to switch off cholesterol genes for good, in early trials.
AI that spots heart risk early from an ECG or a scan.
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Brain and nerves
Nerve cells that slowly stop working
What it is
In neurodegenerative diseases, nerve cells in the brain or spinal cord stop working and die over time - affecting memory (Alzheimer's disease), movement (Parkinson's disease) or muscles (ALS).
Proteins fold the wrong way and clump together inside or between nerve cells - amyloid and tau in Alzheimer's disease, alpha-synuclein in Parkinson's disease.
Inflammation, some genes (such as APOE4) and, above all, age raise the risk.
🫀 What it does to the body
As connections between nerve cells are lost, memory, thinking, movement or speech fade.
The changes start years - often decades - before the first symptoms.
🧱 Why it is hard to cure
Most medicines cannot easily pass the blood-brain barrier that protects the brain.
By the time symptoms appear, many nerve cells are already lost, and they do not grow back.
Many drug trials have failed, partly because the diseases are found late.
🚀 What research is trying now
Antibodies that clear amyloid and modestly slow early Alzheimer's disease (approved in some countries).
Blood tests that detect Alzheimer's changes years earlier.
Gene-targeted medicines, such as one approved in the US for an inherited form of ALS.
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Infections
Germs against the immune system
What it is
Infectious diseases are caused by germs - bacteria, viruses, parasites or fungi - that enter the body and multiply. Examples are tuberculosis, malaria and dengue.
Germs spread through the air, water and food, by touch, through blood, or by insects such as mosquitoes.
A weak immune system, crowded housing, poor sanitation and lack of vaccines raise the risk.
🫀 What it does to the body
Germs damage the tissues they live in - the lungs in tuberculosis, the blood in malaria.
The immune system fights back, causing fever and inflammation.
🧱 Why it is hard to cure
Germs evolve resistance to medicines, as in drug-resistant tuberculosis and malaria.
Some diseases still have no vaccine, or only a partly protective one.
The people most affected are often the hardest to reach with tests and treatment.
🚀 What research is trying now
New antibiotics and shorter tuberculosis treatments.
Malaria vaccines now recommended by the World Health Organization for children.
AI to design new antimicrobial molecules, and faster tests that also detect drug resistance.
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Autoimmune diseases
The immune system attacking the body
What it is
In autoimmune diseases the immune system, which should fight germs, attacks the body's own healthy tissue - the joints in rheumatoid arthritis, many organs in lupus, nerves in multiple sclerosis.
A mix of genes and triggers - such as infections, smoking or hormones - but the exact cause is often unknown.
They are more common in women.
🫀 What it does to the body
Long-lasting inflammation causes pain, swelling and tiredness, and can damage joints and organs.
🧱 Why it is hard to cure
Calming the immune system too much makes infections more likely.
Flare-ups are hard to predict, and most of these diseases can be controlled but not yet cured.
🚀 What research is trying now
Targeted medicines (biologics, JAK inhibitors) that block single steps of inflammation.
CAR-T cell therapy that "resets" the immune system, showing early promise in severe lupus.
Therapies that teach the immune system to tolerate the body again.
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Genetic diseases
One changed letter in the DNA
What it is
Genetic diseases are caused by a change in a gene (or a chromosome), often inherited from the parents - such as sickle cell disease, cystic fibrosis and Duchenne muscular dystrophy.
A gene is a recipe for a protein. A change in its DNA letters can make the protein faulty or missing.
The change can be inherited from one or both parents, or happen for the first time in a child.
🫀 What it does to the body
In sickle cell disease, a change in the haemoglobin gene bends red blood cells into a sickle shape; they get stuck in small blood vessels, causing pain, anaemia and organ damage.
🧱 Why it is hard to cure
Fixing a gene safely in the right cells of the body is technically difficult.
Gene therapies are very expensive, and many genetic diseases are rare, with few patients for trials.
🚀 What research is trying now
Gene therapies that add a working copy of a gene.
CRISPR gene editing, now approved for sickle cell disease and beta thalassaemia.
RNA medicines that work around a faulty gene.
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Lungs and breathing
Airways that narrow and swell
What it is
Chronic lung diseases such as asthma and chronic obstructive pulmonary disease (COPD) damage or inflame the airways and lungs, so breathing becomes hard.
Genes can make a person more or less likely to get a disease.
Environment and lifestyle - infections, diet, smoking, pollution, activity - push the risk up or down.
Errors build up in the body over the years, which is why many diseases are more common with age.
🫀 What it does to the body
Each disease affects the body in its own way; the summary above explains this one.
🧱 Why it is hard to cure
The biology is often only partly understood.
A medicine has to be both effective and safe, and proving that in clinical trials takes years.
🚀 What research is trying now
Studying which genes are linked to the disease - AI Cure shows them below, ranked by evidence.
Testing whether medicines approved for other diseases could help.
ℹ️General information from public sources, not a recommendation for you. Only your doctor and the trial team can decide what is right for you. In an emergency call your local emergency number. Terms of use
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AI Cure shows public evidence (Open Targets, ClinicalTrials.gov, PubMed, openFDA, DepMap, AlphaFold) with its source, and AI summaries that cite it — not medical advice and not a cure. Treatment decisions belong with your doctor. Research ideas are shared only with approved researchers and labs, who can test them. In an emergency call your local emergency number (112 in India and Europe, 911 in the US). AI Cure Terms of Use · Privacy
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