Loss of appetite
A reduced desire to eat. A short-lived dip with an infection or stress is normal, but a persistent loss of appetite — especially with weight loss — is a broad, important symptom that can reflect infection, mood, medication, or digestive, hormonal, kidney, liver or other disease.
What it means
Loss of appetite (medically, anorexia — not to be confused with the eating disorder anorexia nervosa) is a reduced drive to eat. Appetite is controlled by a web of signals from the gut, hormones, mood and the brain, so many things disturb it. A brief loss with a viral illness, pain or stress is ordinary and self-correcting. Persistent loss of appetite, particularly when it comes with unintentional weight loss, is what matters, because it is a common thread across a wide range of conditions: infections, depression and anxiety, medications (many drugs blunt appetite), digestive disease, an under- or over-active thyroid, poorly controlled diabetes, kidney or liver disease, and, importantly, some cancers. Its value as a symptom is precisely that it is non-specific — it prompts a broad but targeted look for a cause, guided by the other symptoms.
Common causes
- Acute infection — a common, short-lived cause.
- Depression, anxiety, stress — very common; appetite often tracks mood.
- Medications — many, including some antibiotics, painkillers, chemotherapy, and stimulants.
- Digestive disease — reflux, ulcers, gallstones, inflammatory bowel disease, coeliac.
- Thyroid disease — usually hypothyroidism.
- Poorly controlled diabetes; kidney or liver disease — uraemia and liver failure blunt appetite.
- Chronic illness and, importantly, some cancers — persistent loss with weight loss.
- Older age — appetite naturally declines, but new loss still deserves attention.
Lab work-up approach
For persistent loss of appetite, especially with weight loss, a broad baseline panel helps map the ground: full blood count and CRP (infection, inflammation, anaemia), TSH (thyroid), fasting glucose/HbA1c (diabetes), kidney function (creatinine, urea, sodium), and liver function tests. Calcium is checked because a high calcium suppresses appetite. The pattern, combined with the person's other symptoms, directs any further tests — imaging or endoscopy where a digestive or serious cause is suspected. Mediora.AI surfaces the thyroid, kidney, liver and inflammatory pattern from your results to help narrow the field; the clinical evaluation belongs with your doctor.
Tests Mediora.AI can interpret
Related conditions
Panels to consider
When to see a doctor
See a doctor for loss of appetite that lasts more than a week or two, or that comes with unintentional weight loss, persistent tiredness, difficulty swallowing, abdominal pain, jaundice, or a change in bowel habit — this combination warrants a proper look for a cause. In older adults, a new poor appetite can point to depression, medication effects, or an underlying illness and shouldn't simply be put down to age. A brief appetite dip during a cold or a stressful spell usually needs nothing more than time. Mediora.AI helps screen the common medical contributors; a persistent loss of appetite is assessed by your doctor.