Complex & Invisible Health
Living with a complex or invisible illness often means navigating symptoms that affect several body systems, limited testing options and inconsistent support. These guides explain conditions, relevant biological pathways and available testing in plain language, including what each test can and can't tell you.
Genetic characteristics
Inherited DNA variants that generally stay the same for life. They may indicate predispositions, not diagnoses.
Measurable biomarkers
Things your body contains or produces right now, such as gut microbes, which can change over time.
What tests can't do
No test on this site diagnoses a complex illness or establishes the cause of symptoms. Results are one piece of a bigger picture.
Explore Complex & Invisible Health
Choose a topic to learn about symptoms, biological factors, testing and its limitations.
Mast Cell Activation Syndrome (MCAS) & Histamine
Mast cells, histamine and why these conditions are hard to pin down.
Learn more →POTS & Dysautonomia
When the autonomic nervous system struggles with standing upright.
Learn more →Ehlers-Danlos Syndrome (EDS) & Hypermobility
Inherited connective tissue disorders and hypermobility spectrum disorders.
Learn more →ME/CFS
Post-exertional malaise and what research is uncovering.
Learn more →Fibromyalgia
Widespread pain, fatigue and how the nervous system processes pain.
Learn more →Small Fiber Neuropathy
Damage to small nerve fibres, its known causes and how it's assessed.
Learn more →Chronic Migraine
A neurological condition with strong family links.
Learn more →Brain Fog & Cognitive Concerns
Common contributors and when to seek an assessment.
Learn more →Irritable Bowel Syndrome (IBS)
A disorder of gut-brain interaction and the conditions to rule out.
Learn more →Celiac Disease
The HLA genes linked to celiac disease and what a result means.
Learn more →Food Intolerances
How intolerance differs from allergy and celiac disease.
Learn more →Chronic Urticaria
Recurring hives and swelling, and the role of mast cells.
Learn more →Multiple Chemical Sensitivity (MCS)
Reacting to everyday exposures, and what genetics can and can't say.
Learn more →Mycotoxin Exposure & Testing
Sources of exposure, current research and the limits of testing.
Learn more →The information in this hub is for education only and is not medical advice. It doesn't replace evaluation by a qualified healthcare professional. Health & laboratory disclaimer