Heart palpitations caused by anemia won’t fully stop until your blood can carry enough oxygen again. The pounding, racing, or fluttering sensation happens because your heart is compensating for fewer healthy red blood cells by pumping faster and harder. That means the real fix is treating the anemia itself, but there are things you can do right now to ease the sensation while your body recovers.
Why Anemia Makes Your Heart Race
Red blood cells carry oxygen throughout your body using a protein called hemoglobin. When you’re anemic, your hemoglobin is low, so each pump of blood delivers less oxygen than normal. Your heart responds by speeding up and increasing output, trying to make up the difference through sheer volume. This compensatory tachycardia is your body’s first-line response to reduced oxygen-carrying capacity, and it’s the direct cause of palpitations in anemia.
Iron deficiency is the most common culprit, but low vitamin B12 or folate can also cause anemia and the same cardiovascular strain. Severe anemia of any type puts you at risk for an abnormally fast heart rate and, in extreme cases, heart failure. The worse the anemia, the harder your heart works and the more noticeable the palpitations become.
Calming Palpitations in the Moment
These techniques won’t fix the underlying anemia, but they can settle your heart rate when palpitations flare up.
Box breathing: Inhale slowly for a count of four, hold for four, exhale for four, hold again for four. Repeat the cycle several times or until the palpitations ease. This activates your body’s relaxation response and slows your heart rate.
Vagal maneuvers: These stimulate the vagus nerve, which helps regulate heart rhythm. Try splashing cold water on your face, bearing down like you’re straining on the toilet, or forming your mouth into an “O” and exhaling hard as if blowing through a straw. You can try more than one of these in sequence.
Hydrate with electrolytes: Dehydration makes palpitations worse because it reduces blood volume, forcing your already-strained heart to work even harder. Drink water or an electrolyte-rich beverage. If all you have is plain water, adding a small pinch of salt helps.
Avoid stimulants and triggers: Caffeine, nicotine, alcohol, and even very spicy food can push your nervous system into overdrive and amplify palpitations. Cutting these out won’t instantly stop the sensation, but it should keep episodes from worsening.
Treating the Anemia Itself
The only way to permanently stop anemia-related palpitations is to restore your hemoglobin to a healthy level. Your doctor will typically start with one of two approaches depending on how severe the deficiency is: oral iron supplements (capsules or tablets) or intravenous iron infusions for cases where oral supplementation isn’t absorbing well or the deficiency is severe. They’ll also look for whatever is causing the anemia in the first place, whether that’s heavy periods, a digestive condition limiting absorption, or something else.
If your anemia stems from low B12 or folate rather than iron, the treatment changes accordingly, usually to B12 injections or high-dose oral supplements and folate supplementation.
How Long Until Palpitations Improve
Most people start feeling noticeably better within three to four weeks of beginning iron supplementation. However, it can take two to four months for the treatment to work fully and for your iron stores to rebuild. During that window, palpitations may gradually become less frequent and less intense as your hemoglobin climbs. If you notice no improvement after a month, that’s worth raising with your doctor, as it could signal an absorption issue or a different type of anemia.
Eating to Support Iron Recovery
Supplements do the heavy lifting, but your diet can meaningfully speed up recovery and help maintain healthy iron levels long-term. Iron from food comes in two forms: heme iron from animal sources, and non-heme iron from plants. Your body absorbs heme iron much more efficiently.
The best sources of heme iron are red meat, organ meats, game, and shellfish, with smaller amounts in eggs and poultry. For plant-based iron, focus on beans, lentils, dark leafy greens, nuts, and seeds. Many grain products and soy milks are also fortified with iron.
How you combine foods matters almost as much as what you eat. Vitamin C dramatically boosts absorption of non-heme iron, so pairing a lentil dish with tomatoes, citrus juice, or fresh fruit makes a real difference. On the flip side, calcium and tannins (found in tea and wine) interfere with non-heme iron absorption. Space calcium-rich foods and tea at least one to two hours away from iron-rich meals.
A few more practical tips: eat your iron-rich foods first at a meal before filling up on other things, and consider cooking in cast-iron pans, which can increase the iron content of your food.
When Palpitations Signal Something Serious
Most anemia-related palpitations feel uncomfortable but aren’t dangerous on their own. However, certain patterns require immediate attention. Palpitations lasting longer than 30 seconds continuously are considered a medical emergency. If you experience chest pain, pressure, or tightness alongside palpitations, that could signal a heart attack. Other warning signs include dizziness, lightheadedness, loss of consciousness, a weak or absent pulse, and significant shortness of breath. Any of these combinations warrant calling emergency services rather than waiting it out.
Severe anemia, generally with hemoglobin below 7 to 8 g/dL, can put enough strain on the heart to cause serious complications. If your anemia has been diagnosed as severe or your symptoms are getting worse rather than better, don’t rely on home strategies alone.