Anemia means your blood doesn’t have enough healthy red blood cells to carry oxygen through your body, which can leave you tired, weak, and short of breath. It’s usually a sign of another problem, most often low iron. It’s found with a simple blood test and treated based on the cause.
Find a Duly primary care provider
What is anemia?
Anemia is when you don’t have enough healthy red blood cells, or enough hemoglobin inside them, to carry oxygen around your body. Hemoglobin is the protein in red blood cells that picks up oxygen in your lungs and delivers it everywhere else. When it runs low, your tissues get less oxygen, and that is what leaves you feeling drained.
Here is the key thing to understand: anemia is usually a sign of something else rather than a disease on its own. The real task is finding what is causing it, because that is what decides the treatment. The causes fall into a handful of common types:
| Type | Common cause | How it’s generally handled |
|---|---|---|
| Iron-deficiency | Too little iron, often from blood loss (like heavy periods or bleeding in the gut), low intake, or pregnancy. | Iron replacement when appropriate, along with evaluation and treatment of the reason iron is low, such as menstrual or gastrointestinal blood loss. The most common type. |
| Vitamin-deficiency | Low vitamin B12 or folate, from diet or trouble absorbing them. | Replacing the missing vitamin, by mouth or by injection. |
| Of chronic disease | A long-term illness like kidney disease, cancer, or an autoimmune condition. | Mostly by managing the underlying illness. |
| Inherited | Genetic conditions such as sickle cell disease or thalassemia. | Lifelong care, usually with a hematologist. |
| Other | The bone marrow makes too few red cells, or red cells break down too fast. | Specialist evaluation to pin down the cause. |
Iron deficiency is the most common type, but anemia may also reflect blood loss, kidney disease, red blood cell breakdown, bone marrow disease, or another medical condition. Identifying the cause is essential before choosing treatment.
What are the symptoms of anemia?
Mild anemia often causes no symptoms at all and turns up on routine bloodwork. As it becomes more pronounced, the low oxygen starts to show. Common signs include:
- Unusual tiredness or weakness
- Pale skin, or a washed-out look
- Shortness of breath, especially with activity
- Dizziness or lightheadedness
- Cold hands and feet
- Headaches
- A fast or pounding heartbeat
- Brittle nails, or unusual cravings like chewing ice (a clue to low iron)
Because these symptoms build slowly and overlap with everyday tiredness, anemia is easy to miss. A blood test is the only way to confirm it.
What causes anemia?
Anemia comes about in three broad ways, and pinning down which one is happening guides the whole treatment:
- Blood loss. From heavy periods, bleeding in the digestive tract, surgery, or frequent blood donation.
- Making too few red cells, or faulty ones. From low iron, low B12 or folate, a chronic illness, or a bone marrow problem.
- Red cells breaking down too fast. From some inherited or autoimmune conditions.
Low iron is the most frequent culprit, often tied to blood loss or not getting enough iron from food. Older adults, people with heavy periods, those who are pregnant, and people with a long-term illness are all more likely to develop anemia.
How is anemia diagnosed?
Anemia is diagnosed with a simple blood test called a complete blood count, or CBC. It measures your red blood cells and hemoglobin to confirm anemia, and the size of your red cells offers an early clue to the cause.
From there, follow-up tests narrow it down. These often include iron studies and ferritin, which reflects your iron stores, vitamin B12 and folate levels, and a reticulocyte count to see how fast your marrow is making new cells. If blood loss is suspected, your provider looks for the source. The aim is not just to confirm anemia, but to find what is behind it.
How is anemia treated?
Treatment depends entirely on the cause, which is why diagnosis comes first. Most anemia seen in primary care responds well once the right cause is addressed.
Replacing what is missing
For the nutritional types, the fix is restoring what is low. That means iron for iron-deficiency anemia, taken as pills or, when pills are not enough or not tolerated, given through an IV. Vitamin-deficiency anemia is treated by replacing B12 or folate, by mouth or by injection.
Treating the underlying cause
When anemia comes from blood loss, treating the source matters as much as replacing iron, whether that is managing heavy periods or addressing bleeding in the digestive tract. For anemia of chronic disease, the focus is on managing the long-term illness driving it.
Specialized care for complex anemia
Inherited anemias like sickle cell disease and thalassemia, bone marrow problems, and severe cases call for specialized care from a hematologist. Treatment can include specific medications, and in severe anemia, a blood transfusion.
What is it like to live with anemia?
For many people, anemia is a temporary problem that clears up once the cause is treated, and energy returns as red blood cell levels recover. Iron stores can take a few months to rebuild, so it helps to stick with treatment even after you start feeling better.
When anemia is tied to a long-term or inherited condition, it becomes something you manage over time with regular bloodwork and a steady plan. Either way, staying in touch with your provider, taking any supplements as directed, and eating a balanced diet keep things on track.
Can you prevent anemia?
Many cases, yes, especially the nutritional types. Inherited anemias cannot be prevented, but you can lower your risk of the common kinds by:
- Eating iron-rich foods, like lean meat, beans, and leafy greens
- Getting enough vitamin B12 and folate in your diet
- Treating heavy periods or other ongoing sources of blood loss
- Managing chronic conditions that can lower your blood counts
- Checking with your provider before taking iron, since more is not always better
If you are at higher risk, a routine blood test can catch anemia early, before it has a chance to wear you down.
When should I see a doctor?
Here is how to gauge when low energy or other symptoms need medical attention.
Talk to a provider
Make an appointment if you have ongoing tiredness, weakness, paleness, or shortness of breath, or if you have heavy periods or another reason to be at risk. A primary care provider can run a blood test, find the cause, and start treatment.
Find a Duly primary care provider
Get checked for warning signs
Some signs point to bleeding or a cause that needs prompt evaluation. See a provider soon if you have any of these:
Warning signs that need prompt care
- Black or tarry stools, or blood in your stool
- Blood in your urine
- Very heavy or prolonged menstrual periods
- Unintended weight loss
- Anemia that keeps coming back or does not improve with treatment
Get emergency care
Seek immediate help for chest pain, fainting, severe shortness of breath, a very fast or irregular heartbeat, or signs of heavy bleeding.
Call 911 or go to the nearest ER.
Who treats anemia?
Most anemia is handled by a primary care provider. Internal medicine and family medicine physicians, with the nurse practitioners and physician assistants on their teams, run the bloodwork, find the cause, and treat the common types, which is all many people ever need.
A hematologist, a doctor who specializes in blood disorders, steps in when the cause is unclear, the anemia is severe or not responding, or it stems from an inherited or bone marrow condition. They guide specialized testing and treatment.
Typically, the providers involved are:
- Primary care, including internal medicine and family medicine, for testing, diagnosis, and everyday treatment
- Nurse practitioners and physician assistants, for treatment and follow-up
- Hematology, for unclear, severe, inherited, or hard-to-treat anemia
Your primary care provider usually stays your main point of contact, bringing in a specialist when the cause or treatment calls for it.
Frequently asked questions
Is anemia serious?
It depends on the cause and how low your blood counts are. Mild iron-deficiency anemia is very common and very treatable. Other causes can be more serious, which is exactly why finding what is behind the anemia matters as much as treating the low counts.
What is the most common cause of anemia?
Iron deficiency. It is usually due to blood loss, such as heavy periods or bleeding in the digestive tract, or not getting enough iron from food. That is why treatment so often pairs iron with finding and fixing the source.
Can diet alone fix anemia?
Iron supplements may be recommended after iron deficiency is confirmed. Do not start iron solely because your hemoglobin is low, because not all anemia is caused by iron deficiency. and treatment for whatever is causing it. It is best to check with a provider before starting iron, since taking it when you do not need it can cause problems.
How long does it take to recover from anemia?
It varies by cause. With iron-deficiency anemia, many people feel better within a few weeks of starting treatment, but it can take a few months to fully rebuild iron stores, so it is important to keep going until your provider says to stop.
Where can I get care for anemia in Chicagoland?
Duly primary care providers across the Chicago suburbs can test for anemia, find the cause, and start treatment, and connect you with Duly hematology if the cause is complex or the anemia is severe. You can book a visit online, and video visits work well for follow-ups.
Care at Duly Health and Care
Anemia is common and usually very treatable, but because it is so often a sign of something else, the cause is worth tracking down. Duly primary care providers can run the bloodwork, figure out what is driving your anemia, and start a plan that gets your energy back.
If the cause is complex, the anemia is severe, or it stems from an inherited or blood condition, they will connect you with Duly hematology, keeping everything coordinated. With primary care and hematology across the Chicago suburbs, plus video visits for follow-ups, the right care is within reach.
Find a Duly primary care provider
Medically reviewed by [Reviewer Name, MD] · Last reviewed July 2026