Vitamin deficiency

Vitamin deficiency can lead to fatigue, weakened immunity, and other health issues. Get online medical advice from registered online doctors in Australia, available 24/7.

When to consult a doctor for vitamin deficiency?

If you experience persistent fatigue or weakness

If you feel constantly tired, low in energy, or weak despite adequate rest and sleep, it may indicate an underlying vitamin deficiency that requires medical evaluation and blood testing.

If you develop unusual physical or neurological symptoms

Seek medical advice if you notice frequent infections, dry skin, brittle nails, hair thinning, tingling or numbness, memory issues, muscle cramps, or changes in vision. These symptoms can signal specific nutrient deficiencies that need targeted treatment.

If you are pregnant, planning pregnancy, or concerned about a child’s growth

Proper vitamin levels are essential during pregnancy and childhood. Consult a GP if your child has slow growth or developmental concerns, or if you are pregnant and want to ensure optimal nutrient levels for a healthy pregnancy.

This guide does not replace professional care. Consult a doctor to manage your symptoms. In emergencies, call 000. The content is research-backed & Medically reviewed by Dr.Nelson Lau, MBBS FRACGP, GP & Digital Health Specialist.

Common symptoms

Fatigue and weakness: Persistent tiredness, low energy, or muscle weakness.

Frequent infections: A weakened immune system leading to recurrent colds or illnesses.

Skin and hair issues: Dry, flaky skin, brittle nails, hair thinning, or excessive hair loss.

Vision problems: Night blindness, dry eyes, or overall vision deterioration.

Muscle cramps and joint pain: Unexplained muscle aches, cramps, or bone pain.

Tingling or numbness: A sensation of pins and needles in hands and feet, indicating nerve-related issues.

Memory problems and poor concentration: Difficulty focusing, brain fog, or forgetfulness.

Slow wound healing: Cuts and bruises taking longer than usual to heal.

Unexplained mood changes: Deficiencies in B vitamins, vitamin D, and iron have been linked to mood disturbances

How telehealth can help

Hola Health provides a convenient way for you to consult a doctor online, 24/7 across Australia. Our AHPRA-registered Australian online GP can conduct a comprehensive assessment to provide appropriate care.

Clinical note: An online GP assessment helps provide medical advice for your symptoms and evaluate if a face-to-face consultation or physical examination is needed. Online GPs can provide prescriptions, referrals or GP medical certificates if clinically indicated. Telehealth is a complementary service; a physical examination could be needed to assess further. Telehealth is a complementary service; vitamin deficiency cannot be diagnosed without blood testing. Your GP may issue a pathology referral for relevant blood tests during your consultation. Diagnosis of the specific deficiency and appropriate treatment requires pathology results. Consultations are secure, encrypted, and Australian-stored (in compliance with the Australian Privacy Principles). In case of emergency, call 000 immediately. We recommend sharing your consult summaries with your regular GP to ensure continuity of care.

Frequently Asked Questions

Which vitamin deficiency causes hair loss?

Hair loss can be linked to several nutrient deficiencies, including low levels of vitamin D, vitamin B12, biotin, and iron. Genetics, hormonal changes, stress, and medical disorders are also possible causes for hair loss. A medical practitioner can help you assess the root cause of your recurrent hair loss.

Which vitamin deficiencies are most common? 

Common vitamin deficiencies vary with diet, lifestyle, age, and health status.

Some commonly seen deficiencies include:

Vitamin D deficiency.
Vitamin B12 deficiency.
Folate deficiency.
Vitamin C deficiency.

A balanced diet and appropriate medical checks can help identify and manage deficiencies.

Can vitamin deficiency cause fatigue or low energy?

Yes, some vitamin deficiencies can lead to fatigue and poor energy. For example, vitamin B12, vitamin D, and folate deficiencies can affect energy levels and overall well-being. However, several factors can cause fatigue, including insufficient sleep, stress, illnesses, and other medical disorders. If fatigue persists, it’s important to see a doctor.  (Please note that some symptoms may require an in-person physical examination or testing which cannot be completed via telehealth.)

Can vitamin deficiencies affect my immune system?

Yes, some vitamin deficiencies can affect immune system function. Vitamins D, C, and B12 are vital for maintaining adequate immunological function. Maintaining a well-balanced, nutrient-rich diet can improve overall health.

What blood tests are used to diagnose vitamin deficiencies?

Blood testing can determine vitamin levels and detect any deficiencies. Depending on your symptoms and health history, a healthcare provider may suggest tests like:

Vitamin D testing
Vitamin B12 and folate testing
Iron studies
Other nutrient-related tests, where appropriate

What is the difference between a vitamin deficiency and a mineral deficiency?  

A vitamin deficiency occurs when the body lacks adequate amounts of essential nutrients such as vitamin D or vitamin B12. A mineral deficiency occurs when the body lacks important minerals such as iron, calcium, magnesium, or zinc. Both vitamins and minerals are essential for the body to function properly.