What Is Haemoglobin and Why Is It Important for Your Health?
In my clinical practice, one of the most common questions patients ask after a blood test is, “Doctor, what is haemoglobin, and should I be worried if it’s low?” Haemoglobin is an important component of your blood that plays a vital role in delivering oxygen throughout the body. When haemoglobin levels are too low, it can affect your energy, overall health, and quality of life.
What Is Haemoglobin?
Haemoglobin is a protein found inside red blood cells. Its primary function is to carry oxygen from the lungs to the body’s tissues and organs. It also helps transport carbon dioxide back to the lungs to be exhaled.
Without adequate haemoglobin, your body may not receive enough oxygen to function efficiently.
What Are Normal Haemoglobin Levels?
Normal haemoglobin levels vary according to age, sex, and individual health conditions. A simple blood test can measure your haemoglobin level and help doctors assess whether it falls within a healthy range.
What Causes Low Haemoglobin?
Low haemoglobin is often associated with anaemia, but there can be several underlying causes.
Common causes include:
- Iron deficiency
- Vitamin B12 deficiency
- Folate deficiency
- Chronic kidney disease
- Chronic inflammatory conditions
- Blood loss from heavy menstrual periods
- Gastrointestinal bleeding
- Certain inherited blood disorders
Identifying the underlying cause is essential because treatment depends on the reason for the low haemoglobin level.
What Symptoms Can Low Haemoglobin Cause?
Patients with low haemoglobin may experience:
- Persistent fatigue
- Weakness
- Dizziness
- Shortness of breath
- Headaches
- Pale skin
- Reduced exercise tolerance
- Rapid heartbeat
Some people may have only mild symptoms, while others experience significant limitations in their daily activities.
How Is Low Haemoglobin Diagnosed?
Diagnosis typically begins with a complete blood count (CBC) test. Depending on the results, additional investigations may be recommended to identify the cause.
These may include:
- Iron studies
- Vitamin B12 testing
- Folate testing
- Kidney function tests
- Evaluation for blood loss
- Additional blood investigations when necessary
Can Low Haemoglobin Be Treated?
Yes. Treatment depends on the underlying cause.
For example:
- Iron deficiency may require dietary changes and iron supplementation.
- Vitamin deficiencies may require replacement therapy.
- Chronic medical conditions may need targeted management.
- In some situations, further investigations may be necessary to identify hidden sources of blood loss.
It is important not to self-diagnose or start supplements without proper medical advice, as inappropriate treatment may delay diagnosis of the actual problem.
When Should You Seek Medical Evaluation?
I encourage patients to seek medical assessment if they experience:
- Ongoing fatigue without a clear reason
- Frequent dizziness
- Unexplained shortness of breath
- Pale appearance
- Symptoms that interfere with daily activities
Early evaluation allows doctors to identify potential causes and provide appropriate management before complications develop.
Doctor's Insight
As a doctor, I often remind patients that low haemoglobin is not a diagnosis by itself—it is a sign that the body may be trying to tell us something important. Understanding the cause is just as important as correcting the number. If you have symptoms suggestive of low haemoglobin or have concerns about your blood test results, seeking medical advice can help ensure timely evaluation and appropriate care.
– Dr. Balavendrian Anthony
Physician | Palliative Care
Evercare Medical Care Centre, Penang, Malaysia.
Frequently Asked Questions
Haemoglobin is a protein in red blood cells that carries oxygen throughout the body.
Low haemoglobin can reduce oxygen delivery to tissues, causing symptoms such as fatigue, weakness, dizziness, and shortness of breath.
Low haemoglobin is often a sign of anaemia, but further evaluation is needed to determine the cause.
Common causes include iron deficiency, vitamin deficiencies, chronic diseases, and blood loss.
Depending on the cause, dietary improvements may help, particularly when iron deficiency is involved. However, medical evaluation is important to determine the underlying reason.
If you experience persistent fatigue, dizziness, shortness of breath, or have been told your haemoglobin is low, medical assessment is recommended.