Anemia: Types, Symptoms, Causes & What You Can Do

Anemia is a condition where your body doesn't have enough healthy red blood cells to carry oxygen to your organs. It can range from mild and temporary to severe and life-threatening — and it comes in many forms, including alpha thalassemia, aplastic anemia, and neonatal anemia. Understanding which type you're dealing with is the first step toward supporting your health.

What Is Anemia?

Anemia occurs when your body doesn't produce enough healthy red blood cells, or when those cells don't contain enough hemoglobin — the protein that carries oxygen throughout your body. Without adequate oxygen delivery, your organs and tissues can't function properly.

Anemia can happen for three main reasons:

• Your body doesn't make enough red blood cells
• Bleeding causes you to lose red blood cells faster than they can be replaced
• Your body destroys red blood cells prematurely

While many cases are mild, some forms of anemia are serious and require prompt attention. Below, we break down the most important types.

Alpha Thalassemia: A Genetic Blood Disorder

Alpha thalassemia is an inherited blood disorder that reduces the production of hemoglobin. It's caused by deletions in the HBA1 and HBA2 genes, which are responsible for making alpha-globin — a key component of hemoglobin. Each person normally has four alpha-globin alleles; the severity of alpha thalassemia depends on how many are missing or non-functional.

The Four Types of Alpha Thalassemia

Type	Alleles Lost	Severity
Silent Carrier	1 of 4	No symptoms
Alpha Thalassemia Trait	2 of 4	Mild anemia, small pale red blood cells
HbH Disease	3 of 4	Moderate anemia, enlarged spleen/liver, jaundice
Hb Bart Syndrome	4 of 4	Severe — usually fatal before or shortly after birth

Who Is Most at Risk?

Alpha thalassemia is most common in Southeast Asia, the Mediterranean, Africa, the Middle East, India, and Central Asia. Thousands of infants are born with HbH disease or Hb Bart syndrome each year worldwide.

How Is It Inherited?

Alpha thalassemia is passed down from parents. If both parents are missing at least one alpha-globin allele, their children are at risk of inheriting more severe forms. Genetic counseling is recommended for families with a known history of the condition.

Aplastic Anemia: When Bone Marrow Stops Working

Aplastic anemia is a rare but serious condition where the bone marrow stops producing enough new blood cells — red blood cells, white blood cells, and platelets. This leaves the body vulnerable to fatigue, infections, and uncontrolled bleeding.

Common Symptoms

• Persistent fatigue and weakness
• Pale or yellowish skin
• Frequent or prolonged infections
• Unexplained bruising or bleeding
• Shortness of breath
• Rapid or irregular heartbeat
• Nosebleeds and bleeding gums
• Dizziness or headaches

What Causes Aplastic Anemia?

The most common cause is the immune system mistakenly attacking the bone marrow's stem cells. Other contributing factors include:

• Radiation or chemotherapy — can damage healthy stem cells as a side effect
• Toxic chemical exposure — pesticides, insecticides, and benzene have been linked to aplastic anemia
• Certain medications — including some antibiotics and rheumatoid arthritis drugs
• Viral infections — hepatitis, Epstein-Barr virus, cytomegalovirus, and HIV
• Autoimmune diseases — where the immune system attacks healthy bone marrow cells
• Pregnancy — in rare cases, the immune system may target bone marrow
• Unknown causes — called idiopathic aplastic anemia

Risk Factors

• High-dose radiation or chemotherapy
• Exposure to toxic chemicals
• Certain prescription medications (e.g., chloramphenicol)
• Autoimmune conditions or serious infections

Can It Be Prevented?

Most cases of aplastic anemia cannot be prevented. However, avoiding unnecessary exposure to pesticides, herbicides, organic solvents, and other toxic chemicals can reduce your risk.

Neonatal Anemia: Anemia in Newborns

Neonatal anemia occurs when a newborn's red blood cell count falls below the normal range for their age. It's more common than many parents realize — and in most cases, it resolves on its own.

Why Does It Happen?

• Physiologic anemia — the most common type; occurs because the baby's body is growing so fast that red blood cell production temporarily lags behind
• Blood type mismatch (Rh/ABO) — when the mother's and baby's blood types are incompatible, the baby's red blood cells may break down too quickly, often causing jaundice
• Frequent blood draws in the NICU — necessary for monitoring, but can deplete red blood cells faster than the body replenishes them
• Prematurity — premature babies have fewer red blood cells and a shorter red blood cell lifespan (anemia of prematurity)
• Internal bleeding or fetal-maternal blood transfer — less common but possible

Signs to Watch For

• Pale skin
• Poor feeding or tiring quickly during feeds
• Rapid heartbeat or fast breathing at rest
• Unusual listlessness or low energy

Many newborns with anemia show no symptoms at all. A healthcare provider will determine whether any support is needed based on the baby's hemoglobin levels and overall condition.

Iron Deficiency Anemia in Infants

Iron deficiency anemia is the most common nutritional deficiency in infants and young children worldwide. It typically affects babies between 9 and 24 months of age, and it's largely preventable with the right diet and feeding practices.

Common Causes in Infants

• Starting cow's milk too early (before 12 months) — milk is very low in iron
• Exclusively breastfeeding without iron supplementation after 4 months
• Inherited conditions like thalassemia or sickle cell anemia
• Hemolytic conditions where red blood cells break down too quickly

Symptoms in Infants

• Pale skin, lips, or nail beds
• Fatigue or falling asleep during feeding
• Restlessness or irritability
• Yellowing of skin or eyes (jaundice)
• Dark urine
• Severe cases: shortness of breath, rapid heart rate, swollen hands/feet, dizziness

How Is It Diagnosed?

The American Academy of Pediatrics (AAP) recommends a hemoglobin blood test for all infants at 12 months of age. Key tests include:

• Hemoglobin and hematocrit — measures red blood cell levels
• Complete blood count (CBC) — provides a full picture of blood cell health
• Iron studies — measures iron levels in the body
• Peripheral smear — examines blood cells under a microscope

Prevention: What Parents Can Do

• Avoid cow's milk until your baby is at least 12 months old
• If breastfeeding, ask your provider about iron drops starting at 4 months
• Choose iron-fortified infant formula if formula feeding
• After 6 months, introduce iron-rich solid foods: red meat, egg yolks, beans, leafy greens, iron-fortified cereals
• Pair iron-rich foods with vitamin C sources (citrus, tomatoes, broccoli) to boost absorption
• After 12 months, limit milk to no more than 2 cups per day

Can Anemia Be Life-Threatening?

Yes — in its severe forms, anemia can be life-threatening. When organs don't receive enough oxygen over time, the consequences can be serious. Here's what to know:

• Aplastic anemia can be fatal if the bone marrow fails to produce enough blood cells and the condition goes unaddressed
• Hb Bart syndrome (the most severe form of alpha thalassemia) is usually fatal before or shortly after birth
• Paroxysmal nocturnal hemoglobinuria (PNH) — a rare condition related to aplastic anemia — causes dangerous blood clots and destroys blood cells
• Severe iron deficiency anemia in infants can affect brain development and cognitive function if left unaddressed

The good news: most forms of anemia are manageable when identified early. Regular blood tests for iron and hemoglobin levels are the most reliable way to stay informed about your blood health.

Frequently Asked Questions About Anemia

Tools to Support Your Blood Health Monitoring

At-Home Testing	Hemoglobin Monitoring	Iron & Blood Tests
Anemia Tests at Home Quick, convenient screening	Best Home Hemoglobin Meters Track your levels regularly	Blood Test for Iron Understand your iron status

References

1. Alpha Thalassemia — MedlinePlus Genetics
2. Alpha Thalassemia — KidsHealth (reviewed by Dr. Corinna L. Schultz, MD)
3. Iron Deficiency and Other Types of Anemia in Infants and Children — AAFP
4. Iron-Deficiency Anemia in Children — Cedars-Sinai

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