Pregnancy fatigue: why it happens and how to manage it
Feeling completely wiped out in early pregnancy is one of the most common experiences expectant parents describe, and it often catches people off guard by how intense it can be. This is not simply a case of needing more sleep. From the very first weeks, your body is undergoing enormous physiological changes, and those changes carry a real energy cost. Understanding why fatigue happens, when it is likely to lift, and what practical steps can help will make this phase of pregnancy a little more manageable.
Why does pregnancy cause such extreme tiredness?
The fatigue of early pregnancy has several overlapping causes, all of which arrive at once. One of the main drivers is progesterone: this hormone rises rapidly in the first trimester and has a naturally sedative effect on the body, making you feel sleepy and physically heavy even during the day. At the same time, your body is taking on one of its most demanding construction projects, forming the placenta from scratch. The placenta will eventually sustain your baby throughout the rest of the pregnancy, but building it in those early weeks requires a significant and sustained energy output.
On top of that, your blood volume begins to increase substantially to support the growing pregnancy, which places extra demands on your heart and circulation. Your metabolic rate rises too. Combined, these physical changes mean your body is working considerably harder than usual around the clock, even when you feel as though you are doing nothing at all. The emotional dimension of pregnancy also plays a part: whether the feelings are excitement, anxiety, uncertainty, or a mixture of all three, they carry their own kind of weight that adds to an already full load.
When does pregnancy fatigue ease?
For most people, the exhaustion of the first trimester begins to lift as they move into the second trimester. Hormone levels stabilise, the placenta is fully established and takes over supporting the pregnancy, and many people find they have noticeably more energy from around week 13 or 14 onwards. This midpoint of pregnancy is often described as the most comfortable phase.
It is worth knowing, however, that fatigue can return in the third trimester. As your baby grows larger and heavier, the physical demands on your body increase again. Sleep quality often deteriorates in the later months too, disrupted by physical discomfort, the need to use the bathroom frequently, and the difficulty of finding a comfortable position. Being aware of this pattern can help you pace yourself and plan ahead rather than expecting energy levels to stay consistently high right through to the end.
The link between anaemia and pregnancy fatigue
Anaemia is very common during pregnancy, and it is one of the most significant reasons why some people experience fatigue that feels out of proportion even compared with typical pregnancy tiredness. When iron levels are low, the blood carries less oxygen around the body, and the result is a deep and persistent exhaustion that does not improve much with rest. Symptoms can also include breathlessness with minimal exertion, feeling faint, and a noticeable pallor.
If your fatigue feels particularly severe, or if you are also experiencing any of these additional symptoms, it is worth raising it with your midwife or GP. A straightforward blood test can check both your iron levels and your thyroid function, as an underactive thyroid is another possible cause of extreme tiredness. Eating iron-rich foods throughout your pregnancy, including red meat, beans, lentils and fortified breakfast cereals, can help support your levels, though supplementation may be needed if anaemia is confirmed.
Restless legs and disrupted sleep
Restless legs syndrome is a condition that becomes noticeably more common during pregnancy. It causes an uncomfortable, often irresistible urge to move the legs, particularly in the evenings and at night, which makes it very difficult to fall or stay asleep. If you are finding that your sleep is being disturbed by unusual sensations in your legs, mention this to your midwife. Poor sleep compounds daytime fatigue significantly, so addressing any specific sleep disruptors is a worthwhile step rather than simply accepting broken nights as inevitable.
Practical ways to manage tiredness in pregnancy
There is no single solution that eliminates pregnancy fatigue, but a range of practical adjustments can meaningfully reduce its impact. The most straightforward is to go to bed earlier than you normally would. This is not about giving up your evenings forever, but about recognising that your body genuinely needs more sleep right now and adjusting accordingly rather than pushing through.
Short daytime naps, if your circumstances allow them, are genuinely restorative. Even 20 minutes lying down can take the edge off afternoon exhaustion. Beyond sleep itself, consider where you can reduce your demands: ask for help with household tasks, delegate where possible at work, and be honest with people close to you about how you are feeling. Many people try to maintain their usual pace in early pregnancy, particularly before they have told anyone, which can make an already tiring time considerably harder.
Staying well hydrated supports your energy levels and general wellbeing throughout pregnancy. Eating regularly to keep blood sugar stable, rather than going for long gaps between meals, also helps. Include plenty of iron-rich foods in your diet as a matter of course, and speak to your midwife or GP if you are concerned that fatigue might indicate an underlying issue such as anaemia or a thyroid problem.
Frequently asked questions
Why am I so tired in early pregnancy?
Fatigue in the first trimester is largely driven by a rapid rise in progesterone, which has a sedative effect. Your body is also building the placenta and dramatically increasing blood volume, all of which demands a great deal of energy. The emotional adjustment to pregnancy adds to the load.
When does pregnancy fatigue get better?
For most people, fatigue eases noticeably in the second trimester as hormone levels stabilise. It often returns in the third trimester as the baby grows heavier and sleep becomes more disrupted by physical discomfort and frequent trips to the bathroom.
Could my fatigue be a sign of anaemia?
Anaemia is very common in pregnancy and causes fatigue that goes beyond the usual tiredness. If you feel exhausted even after rest, feel short of breath on minimal exertion, or feel faint, it is worth asking your midwife or GP for a blood test to check your iron levels.
What can I do to manage pregnancy tiredness?
Rest when you can, go to bed earlier, and accept help with tasks. Short daytime naps are beneficial if your situation allows. Eating regularly to keep blood sugar stable, staying hydrated and including iron-rich foods (red meat, beans, lentils, fortified cereals) in your diet all support your energy levels.
Getting ready for your baby's arrival?
Cubby tracks feeds, sleep, nappies and your baby's vaccine schedule from day one, shared with everyone who helps care for them.
Start free