Vitamin & mineral deficiencies: causes, symptoms and remedies

In summary

Vitamin and mineral deficiencies occur when the body does not get or absorb enough essential nutrients needed for normal functioning. They can develop due to inadequate dietary intake, certain health conditions, increased nutritional needs, or problems with nutrient absorption. Recognising symptoms and identifying the underlying cause can help guide appropriate dietary changes or treatment.

Key takeaways

• Vitamin and mineral deficiencies can affect energy, immunity, blood formation, and other body functions.
• A varied diet containing nutrient-rich foods can help meet nutritional requirements.
• Symptoms depend on the specific nutrient involved and the severity of the deficiency.
• Blood tests and clinical evaluation may be used to identify certain deficiencies.
• Treatment depends on the deficient nutrient and its underlying cause.

If you are planning for eligible healthcare expenses related to diagnosis or treatment, check now to explore available plans and understand their coverage, exclusions, and applicable policy terms. You can also learn more about health insurance.

The human body requires 13 essential vitamins and several essential minerals to support normal growth, metabolism, immunity, blood formation, and bone health. Vitamin and mineral deficiencies occur when the body does not receive enough of a nutrient or cannot absorb or use it properly. The effects depend on the nutrient and severity of deficiency.

A balanced diet can help provide essential nutrients and reduce deficiency risk.

Vitamin and mineral deficiencies can result from inadequate intake, poor absorption, increased nutritional requirements, or certain health conditions. Common causes include:

• Poor diet: Limited dietary variety or insufficient nutrient intake can increase deficiency risk.
• Digestive disorders: Conditions such as coeliac disease and Crohn’s disease can interfere with nutrient absorption.
• Malabsorption: Some medical conditions, medicines, or gastrointestinal procedures can reduce nutrient absorption or utilisation.
• Age-related changes: Changes in appetite, digestion, or nutrient absorption with age can contribute to deficiencies.
• Pregnancy and lactation: Increased nutritional requirements during pregnancy and breastfeeding can raise the need for certain vitamins and minerals.
• Restrictive diets: Vegan diets require careful planning, particularly for vitamin B12, while highly restrictive diets can increase the risk of multiple nutrient deficiencies.

Symptoms of vitamin and mineral deficiencies vary according to the nutrient involved, severity, and duration of deficiency. Common symptoms can overlap with other health conditions, so persistent or unexplained symptoms require medical evaluation.

These symptoms do not confirm a deficiency on their own. A healthcare professional may recommend dietary assessment, examination, or blood tests to identify the underlying cause.

Vitamin and mineral deficiencies can cause specific diseases or clinical problems when nutrient levels remain inadequate. The condition and symptoms depend on the nutrient involved.

Vitamin A

Vitamin A deficiency can affect vision, with night blindness being a recognised early sign. Foods such as carrots and spinach provide provitamin A carotenoids, while eggs and some animal foods provide preformed vitamin A.

Vitamin B

Vitamin B refers to a group of vitamins, so deficiency effects vary by type. For example, vitamin B1 deficiency can cause beriberi, while vitamin B12 deficiency can cause megaloblastic anaemia and neurological symptoms. Whole grains, meat, eggs, and fortified foods provide different B vitamins.

Vitamin C

Vitamin C deficiency can cause scurvy, which may involve swollen or bleeding gums, fatigue, and poor wound healing. Citrus fruits, peppers, broccoli, strawberries, and potatoes are dietary sources of vitamin C.

Vitamin D

Vitamin D deficiency can impair bone mineralisation and cause rickets in children or osteomalacia in adults. Fatty fish such as salmon and fortified foods can provide vitamin D, although dietary intake alone may not always meet requirements.

Vitamin K

Vitamin K deficiency can impair normal blood clotting and increase the risk of abnormal bleeding. Green leafy vegetables such as spinach are important dietary sources of vitamin K.

Iron

Iron deficiency can result in iron-deficiency anaemia, which may cause fatigue, weakness, and reduced physical capacity. Dietary sources include lean meat, seafood, poultry, beans, and iron-fortified foods.

Iodine

Iodine deficiency can reduce thyroid hormone production and cause goitre, an enlargement of the thyroid gland. Iodised salt is an important source of iodine in many diets, although intake should remain within recommended limits.

Treatment depends on the specific nutrient, severity of deficiency, underlying cause, and ability to absorb the nutrient. Dietary changes may be sufficient for some mild deficiencies, while others require supplements or treatment of an underlying medical condition. Supplements should be taken at an appropriate dose under professional guidance, particularly for iron, iodine, and fat-soluble vitamins.

Persistent symptoms or suspected deficiency should be evaluated by a healthcare professional to identify the cause and appropriate treatment.

You can reduce the risk of vitamin and mineral deficiencies by maintaining a varied diet and addressing individual nutritional needs. These four steps can support adequate nutrient intake:

1. Eat a balanced diet: Include vegetables, fruits, whole grains, pulses, nuts, seeds, dairy or alternatives, and suitable protein sources.
2. Limit highly processed foods: Reduce foods high in added sugars, salt, and saturated fat while prioritising nutrient-rich options.
3. Get appropriate sunlight exposure: Sensible sunlight exposure can support vitamin D production, depending on factors such as skin type, location, season, and clothing.
4. Use supplements when prescribed: Take vitamin or mineral supplements when recommended by a healthcare professional based on your nutritional needs or deficiency.

Balanced nutrition provides the vitamins, minerals, protein, carbohydrates, fats, and other nutrients required for normal growth, metabolism, immunity, and body function. A varied diet can help prevent nutrient deficiencies by combining foods from different food groups. The World Health Organization reported that 2.69 billion people, or 32.7% of the global population, could not afford a healthy diet in 2025, highlighting the wider challenge of accessing nutritious foods. Choosing vegetables, fruits, whole grains, pulses, nuts, seeds, and suitable protein sources can help improve dietary variety and nutrient intake. Individual requirements can vary with age, health status, pregnancy, and lifestyle.

Vitamin and mineral deficiencies are assessed through symptoms, medical history, dietary evaluation, and laboratory tests. The exact tests depend on the suspected nutrient and symptoms.

1. Recognise possible symptoms: Persistent fatigue, weakness, numbness, pale skin, poor wound healing, or other unexplained symptoms can warrant evaluation.
2. Undergo relevant blood tests: A doctor may recommend tests such as a complete blood count (CBC), serum ferritin, vitamin B12, vitamin D, or thyroid tests based on clinical findings. Not every test is needed for everyone.
3. Consult a doctor: A healthcare professional can interpret results alongside symptoms, diet, medicines, and medical history to identify the underlying cause.
4. Repeat testing when advised: Follow-up tests may be recommended after treatment to assess whether nutrient levels have improved.

Health insurance coverage for vitamin and mineral deficiency diagnosis and treatment depends on the policy terms, type of cover, and whether the expense is eligible under the plan. Depending on the policy, covered healthcare expenses may include laboratory tests such as a complete blood count (CBC), serum vitamin D, or serum vitamin B12, along with eligible consultations and prescribed medicines or supplements. OPD consultations and pharmacy expenses may be covered only when the policy specifically includes these benefits. Before seeking treatment, review the policy documents for covered expenses, exclusions, limits, and applicable conditions. You can explore mediclaim insurance to understand available health insurance options and their applicable coverage terms.

Conclusion 

Vitamin and mineral deficiencies can affect energy, immunity, blood formation, bone health, and other essential body functions. A balanced and varied diet can help prevent deficiencies, while diagnosis may involve symptom assessment, dietary evaluation, and appropriate laboratory tests. Treatment depends on the specific deficiency and may include dietary changes, supplements, or management of an underlying condition.

If you are planning for eligible healthcare expenses related to diagnosis or treatment, explore plans to review available health insurance options, coverage details, exclusions, and applicable policy terms.