If you keep asking "why am I always unwell?", the medical word for what you feel is malaise, and it has many possible causes, from anemia and thyroid disease to the after-effects of an infection, long COVID and ME/CFS. A doctor starts with your history and targeted blood tests. If those come back normal, measuring immune proteins can add objective data.
Key takeaways
- Malaise, a general feeling of discomfort, illness or lack of well-being, is a symptom that many conditions share (MedlinePlus).
- Doctors look first for common, treatable causes with a blood count, a metabolic panel, thyroid tests and inflammation markers (CDC).
- Persistent symptoms without an explanation are common: about one in five primary care consultations involve them (2011 review).
- Long COVID has no approved laboratory test, and routine blood tests may be normal in people who have it (CDC).
- Immune and inflammation panels show where many proteins sit against a healthy reference. They do not diagnose the reason you feel unwell.
Why am I always unwell?
Malaise is the medical word for a general feeling of discomfort, illness or lack of well-being (MedlinePlus). It describes an experience and points to no single cause. People who feel it most days describe being run down, achy, foggy, or unable to shake the sense that something is wrong.
The causes fall into a few groups. Some are common and treatable, such as anemia and thyroid disease, and a blood test can find them (American Family Physician, 2023). Some follow an infection: immune signalling to the brain produces the fatigue and malaise that researchers call sickness behaviour, and in long illness that signalling can continue (Dantzer et al., 2008). Some are long-term conditions in which feeling unwell is a core feature, such as long COVID and ME/CFS (CDC; CDC). In one person, more than one can apply.
If you have asked yourself "why am I always unwell" for months, you are one of many. About one in five primary care consultations involve persistent symptoms that doctors cannot explain with standard diagnostic criteria (2011 review). The guide to malaise covers the biology in more depth.
What do doctors check first?
A doctor starts with questions: when the feeling began, what came before it, how you sleep, what you take, and whether effort makes it worse the next day. The answers guide the tests. A 2023 review for family doctors advises tests chosen by the history and examination, and notes that testing without specific indications changes management in about 5% of patients (American Family Physician, 2023).
The CDC's guidance for clinicians evaluating ME/CFS shows the usual screening set (CDC):
| Test | Looks for |
|---|---|
| Complete blood count with differential | Anemia, infection and disorders of blood cells |
| Metabolic panel (glucose, electrolytes, kidney and liver tests) | Diabetes, electrolyte problems, kidney or liver disease |
| Thyroid tests | An underactive or overactive thyroid |
| ESR and CRP | Broad signs of inflammation |
| Antinuclear antibodies and rheumatoid factor | Markers used in the workup of autoimmune conditions |
| Urinalysis | Kidney and urinary tract problems |
These tests matter, because a treatable cause changes the plan. Bring a list of everything you take, including supplements, and copies of earlier results, so your doctor can see what earlier tests covered.
What if every test comes back normal?
A normal set of results makes the common causes less likely. It says little about the immune signalling a standard panel does not measure. CRP, the one inflammation marker on most panels, reads inflammation downstream: the liver makes it in response to IL-6 (Hunter and Jones, 2015). A normal CRP leaves most cytokines, interferons and chemokines unexamined.
Normal results leave your symptoms as real as they were. They move the question from "is it one of the common causes?" to "what is going on beyond them, and how do I track it?" A symptom diary, a note of what makes things better or worse, and copies of every result give you and your doctor something to build on. Our piece on what it means when your labs are normal and you are not goes further, and our article on being believed when your symptoms are dismissed covers the conversation with your doctor.
Could it be long COVID, ME/CFS or another post-viral illness?
If the unwell feeling began after an infection, ask your doctor about post-viral conditions. The CDC lists fatigue that interferes with daily life, symptoms that get worse after physical or mental effort, and brain fog among the common symptoms of long COVID (CDC). There is no approved laboratory test for long COVID, and routine blood tests may be normal in people who have it (CDC). Clinicians diagnose it from the history and an examination.
A worsening of symptoms after minor effort has its own name, post-exertional malaise, and the 2015 criteria for ME/CFS require it (CDC). The long COVID guide and the ME/CFS guide cover each condition, including what testing can and cannot show.
What can immune and inflammation testing add?
A broad panel measures what a routine panel leaves out: cytokines such as IL-6 and TNF-α, interferons such as IFN-γ and chemokines such as IP-10, each placed against a healthy reference. Research supports breadth: in a 2023 Nature study, immune profiling across many measures separated people with long COVID from people who had recovered, at the group level (Klein et al., 2023). A retest shows which way each marker moves.
A panel has limits. It cannot explain why you feel unwell, diagnose a condition or choose a treatment, and a group difference in a study is no verdict about one person.
Where Mune Mirror™* fits
Mune Mirror™ measures more than 1,000 immune and inflammation proteins from an at-home sample, benchmarks each against a healthy reference and repeats the measurement over time. Unwellness testing is blood testing for people whose standard labs come back normal but who still feel unwell: the people medicine has no answers for yet. It measures highly selected immune and inflammatory proteins that routine panels do not, so persistent symptoms can be tracked and made visible against a healthy reference. Mune Mirror™ is investigational and for research and informational use. It does not diagnose, treat, cure or prevent any disease.
The guide to unwellness testing explains the approach, and you can see what Mune Mirror™ measures. You bring the results to your own doctor.
Frequently asked questions
Is it normal to feel unwell all the time?
Feeling unwell most days is common, and it deserves a proper look. About one in five primary care consultations involve persistent symptoms that doctors cannot explain with standard criteria. See a doctor to check for common causes, and keep a record of your symptoms.
What blood tests should I ask for if I always feel unwell?
Doctors choose tests from your history and examination. A typical first set includes a complete blood count, a metabolic panel, thyroid tests and inflammation markers such as ESR and CRP. These look for common, treatable causes such as anemia or thyroid disease.
Can inflammation make you feel unwell?
Yes. During an infection, cytokines act on the brain and produce the fatigue and malaise known as sickness behaviour. Researchers study whether immune signalling that continues contributes to long-term malaise. It is one possible factor among several.
When should I see a doctor about feeling unwell?
See a doctor if the feeling lasts for weeks, limits daily life or keeps getting worse. New or severe symptoms, such as chest pain, breathlessness, confusion or a high fever, need urgent care.
Sources
- MedlinePlus Medical Encyclopedia (US National Library of Medicine). Malaise.
- Fibromyalgia: Diagnosis and Management. American Family Physician, 2023.
- Dantzer R, et al. From inflammation to sickness and depression: when the immune system subjugates the brain. Nature Reviews Neuroscience, 2008.
- CDC. Long COVID Signs and Symptoms.
- CDC. IOM 2015 Diagnostic Criteria for ME/CFS.
- Medically unexplained symptoms in primary care: how can doctors help, not hinder? 2011.
- Latimer KM, Gunther A, Kopec M. Fatigue in Adults: Evaluation and Management. American Family Physician, 2023.
- CDC. Evaluation of ME/CFS (for clinicians).
- Hunter CA, Jones SA. IL-6 as a keystone cytokine in health and disease. Nature Immunology, 2015.
- CDC. Long COVID Basics.
- Klein J, et al. Distinguishing features of long COVID identified through immune profiling. Nature, 2023.
Mune Mirror™ is currently in development, and the performance characteristics of this test have not yet been established. It is investigational. It does not diagnose, detect, screen for, treat, cure or prevent any disease. Results are for research and informational purposes, to discuss with your own doctor.