Zinc Deficiency Symptoms: How to Spot Low Zinc
Zinc deficiency symptoms are often subtle and easy to dismiss. Common signs include frequent infections from a weakened immune system, slow wound healing, changes in taste or smell and unexplained weight loss [1]. In more severe cases, deficiency can cause hair loss, skin rashes and chronic diarrhoea [2]. A blood test measures the zinc in your blood.
What are the symptoms of zinc deficiency?
Zinc deficiency rarely causes dramatic symptoms in its early stages. It often shows up as minor problems that are easy to put down to stress or a busy lifestyle [1].
Signs that can appear early include:
- Catching colds more often, or taking longer to recover from minor illnesses [1]
- A blunted sense of taste or smell, or a sudden disinterest in food [3]
- Unexplained fatigue [2]
- Minor skin irritations and slow wound healing [2]
- Unexplained weight loss [1]
| Earlier, subtler signs | More severe or prolonged deficiency |
|---|---|
| Catching colds more often; slow recovery from minor illness | Hair loss |
| Blunted taste or smell; less interest in food | Skin rashes and chronic skin conditions |
| Unexplained fatigue and weight loss | Chronic diarrhoea |
| Minor skin irritations; slow wound healing | Cognitive impairments |
Zinc is essential for the production of an enzyme called gustin, which is vital for taste bud function [3].
In more severe cases, deficiency can manifest as hair loss, skin rashes, and chronic diarrhoea [2].
What does zinc do in the body?
Zinc is a trace mineral that your body needs for immune function, protein synthesis, wound healing and cell division [3]. It is involved in over 300 enzymatic reactions in the body.
Zinc also supports normal growth and development during pregnancy, childhood and adolescence, and is required for a proper sense of taste and smell [4].
The body does not have a specialised zinc storage system, so a continuous dietary supply is necessary.
What causes low zinc levels?
Deficiency can occur if dietary intake is inadequate or if absorption is impaired.
A zinc deficiency might not just be a dietary issue; it could be an early indicator of an underlying gastrointestinal problem that is affecting nutrient absorption [5].
Who is more likely to have low zinc?
Certain groups are at a higher risk of developing a deficiency [6]:
- Older adults, who may absorb less zinc because of changes in digestive function [1]
- People with gastrointestinal diseases
- People with restricted diets, including plant-based diets (see below)
Needs also change with life stage and activity. Pregnant and breastfeeding women have increased zinc requirements to support foetal development and milk production [6].
Intense physical activity can also increase zinc loss through sweat, so athletes may need to pay closer attention to their intake [2].
Which foods contain zinc?
The highest concentrations of zinc are typically in animal products such as meat, shellfish and dairy [4]. Red meat and animal products are significant sources of zinc in the UK diet [5].
Plant foods such as legumes, nuts, seeds and whole grains also contain zinc. However, they contain phytates, compounds that bind to zinc and inhibit its absorption in the digestive tract [3].
The British Dietetic Association notes that this reduced bioavailability means vegetarians and vegans may require up to 50% more zinc in their diet than meat-eaters to maintain adequate levels [5].
How do I know if I have a zinc deficiency?
Symptoms of zinc deficiency can be subtle and varied, making it challenging to identify without proper testing.
A zinc blood test measures the amount of zinc in your blood. It can help provide insight into your nutritional status and may support informed conversations with a healthcare professional about dietary changes or supplementation.
At Clinilabs you can walk in to our clinic in Fitzrovia, central London, for a blood sample, or visit a partner clinic. The sample is analysed in our UKAS-accredited laboratory and your result is ready in 2 days.
A test does not diagnose the cause on its own. A doctor can help interpret your result alongside your symptoms and history.
Why does catching low zinc early matter?
Addressing a zinc deficiency early matters because zinc is involved in so many fundamental bodily processes. Prolonged deficiency can lead to more severe complications, including significant hair loss, chronic skin conditions and even cognitive impairments [6].
Identifying it early gives you the chance to make dietary changes, or targeted supplementation with advice, before these more serious symptoms develop.
What can you do if your zinc is low?
Knowing your level lets you make dietary adjustments with a clear baseline, rather than guessing.
Your result can support informed conversations with a healthcare professional or dietitian, who can help you create a tailored dietary plan and advise whether supplementation is appropriate.
If low zinc may reflect a problem with absorption rather than intake, catching it early can lead to a more comprehensive health assessment [5].
Frequently asked questions
Is zinc a mineral?
Yes. Zinc is an essential trace mineral. The body cannot store it, so it needs a continuous supply from your diet.
What does zinc deficiency look like?
Often it looks like nothing dramatic: more colds, slower wound healing or a duller sense of taste. More severe deficiency can show as hair loss, skin rashes and chronic diarrhoea.
What are the signs of zinc deficiency in women?
Look for the signs listed above, such as frequent infections, slow wound healing and changes in taste or smell. Women who are pregnant or breastfeeding have increased zinc requirements.
Why is zinc essential to the body?
Zinc is involved in over 300 enzymatic reactions and is essential for immune function, protein synthesis, wound healing and cell division. It also supports growth and development and a proper sense of taste and smell.
Can you test zinc levels with a blood test?
Yes. A zinc blood test measures the amount of zinc in your blood. At Clinilabs the Zinc Blood Test is from £50 for the test, with results in 2 days.
References
[1] Patient.info. (2023). Zinc Deficiency, Excess, and Supplementation. https://patient.info/healthy-living/zinc-deficiency-excess-and-supplementation-leaflet
[2] BMJ Best Practice. (2024). Zinc deficiency - Symptoms, diagnosis and treatment. https://bestpractice.bmj.com/topics/en-gb/1195
[3] National Institutes of Health. (2026). Zinc - Health Professional Fact Sheet. https://ods.od.nih.gov/factsheets/Zinc-HealthProfessional/
[4] NHS. (2023). Vitamins and minerals - Zinc. https://www.nhs.uk/conditions/vitamins-and-minerals/zinc/
[5] British Dietetic Association (BDA). (2024). Nutritional considerations for dietitians - Zinc. https://www.bda.uk.com/static/3ee12289-4f63-4511-967863633e3ce39a/Practical-guide-nutritional-considerations-re-ZINC.pdf
[6] NICE. (2024). Zinc deficiency | Treatment summaries - BNF. https://bnf.nice.org.uk/treatment-summaries/zinc-deficiency/
