The Ultimate Guide To Body Changes During Pregnancy

There are many maternal body changes during pregnancy. Some of these changes may be discussed at your prenatal visits; however, given the limited amount of time and amount of information to be shared at each visit, there are topics that will not be discussed unless you express a concern.

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The Ultimate Guide To Body Changes During Pregnancy

This post contains affiliate links. You can read our affiliate disclaimer at the bottom of this post.

This post is a comprehensive (though not ALL-inclusive list) of maternal body changes during pregnancy.

We have included the physical and functional changes you may experience and perhaps, more importantly, we have included lots of tips and links to other articles and products that will help you feel more comfortable as you grow a tiny human!

It is important to understand that these changes (with very few exceptions) will resolve postpartum.

Body Changes During Pregnancy:


Heart Changes

The cardiovascular changes during pregnancy are remarkable. Blood volume increases by 50%, heart rate increases by 20 beats per minute and the total blood pumped each minute increases by 40%!

There is also a decreased return of blood to the mother’s heart due to the weight of the pregnancy on the large vein along the spine. This affects blood flow to the growing fetus.

To improve the blood return to the heart and increase delivery of blood to the developing fetus, pregnant women should never lie on their back (especially during the third trimester) and ideally should lie on their left side.

For more information about this topic please check out our article on Why Left-Sided Sleep During Pregnancy Is Best

Anemia is also an important topic to discuss when it comes to cardiovascular changes since anemia directly affects the oxygen-carrying capacity of the blood to the fetus. There are many causes of anemia.

If you are diagnosed with iron-deficient anemia, your provider will prescribe iron during your pregnancy. Iron should be avoided with certain forms of anemia, so it is important to check with your provider. What Every Pregnant Woman Needs To Know About Anemia

Lung Changes

The enlarging uterus, especially during the later second trimester and into the third trimester, elevates the diaphragm. This anatomical change associated with pregnancy limits lung expansion, lung volume does not decrease significantly due to the outward expansion of the chest wall.

This expansion occurs because the ligaments connecting the ribs are softened by the hormonal effects of pregnancy (progesterone). Some studies suggest the maternal respiratory rate increases slightly to compensate for the changes in lung volume.

Kidney/Bladder Changes

The maternal kidneys exhibit body changes during pregnancy. The kidneys enlarge during pregnancy due to the increased blood volume and cardiac output perfusing the kidneys.

The bladder capacity and size of the ureters and renal pelvis also increase as a result of the relaxation of the smooth muscle in the walls of these structures. This is due to hormonal effects.

The enlargement of the urinary collecting system results in stasis of urine which is associated with an increased risk of urinary tract infections and kidney infections during pregnancy.

Skin Changes

During pregnancy, the hormone responsible for pigmentation, melanocyte-stimulating hormone, increases as does the estrogen hormone. These hormones increase the stimulation of the pigment-producing cells called melanocytes.

Increased pigmentation in the face is also referred to as the “mask of pregnancy”. The nipples and areola also darken. Many women will also observe the development of a dark line down their stomachs in the midline. This is called the linea nigra.

Moles can also darken and clearly this is a change that has to be discussed with your provider to be sure it is the result of the hormonal changes during pregnancy and not cancerous changes.

Skin exposure to the sun should be limited during pregnancy.

Metabolism and Weight Changes:

Weight gain during pregnancy averages between 25 and 35 pounds. However, women who are considered obese (based on BMI) need not gain any weight or may even lose weight.

Women who are below what is considered a normal BMI should gain weight as this can impact normal fetal growth.

To check your BMI use this following linkCLICK HERE  (Courtesy of calculator.net)

Metabolism can increase by as much as 20% during pregnancy, most of this occurring during the third trimester.

Digestive Changes

When discussing body changes during pregnancy, digestive changes are quite common. Most of these changes are due to the hormone: progesterone.

Progesterone relaxes smooth muscle along the intestinal tract. Relaxation of this muscle slows down the intestine.

This smooth muscle relaxation also affects the stomach, delaying the emptying of gastric contents. It is interesting to note that this is why labor and delivery staff prefer laboring patients not have a full stomach, should there be a need for general anesthesia.

Heartburn is another digestive change during pregnancy.  Progesterone relaxes the esophageal sphincter allowing reflux of

stomach contents. Also contributing to heartburn is the pressure of the enlarging uterus on the stomach, causing the reflux of stomach contents into the lower esophagus.

Gallbladder contractility is also slowed and this can result in gallstone production.

Hormone Changes

The following is a list of some of the effects hormones are thought to have on the body changes during pregnancy:

  • Relaxes smooth muscle
  • Softens ligaments
  • Causes nausea
  • Increases pigmentation
  • Tissue swelling
  • Hair loss
  • Bleeding gums.



Swelling is common among the many-body changes during pregnancy, especially during the hot summer months. 

Swelling and fluid retention during pregnancy is a body change that must be monitored during pregnancy as it can be a sign of complications associated with pregnancy,

(ie. preeclampsia, toxemia, gestational hypertension)

swelling during pregnancy

Increased pigmentation:

Any skin pigmentation on your body will very likely become more pronounced during pregnancy. Hyperpigmentation occurs because of increased melanocyte activity due to increased melanocyte-stimulating hormone.


Due to the changes in the cardiovascular system, blood gets channeled to areas of the body that are prone to the pooling of blood. These areas are called venous sinuses and are part of the venous system.

The most noticeable areas involved in this venous pooling are hemorrhoids  (venous sinuses around the rectum and umbilicus), the labia and superficial leg veins (leg varicose veins). Though these vascular changes can pose medical problems, discomfort, and cosmetic concerns, these changes will almost always resolve after pregnancy. Cosmetic concerns can persist and this can be addressed well after the postpartum period.

Hair loss:

Hair loss occurs postpartum and most often, will resolve over time. This is concerning to many new mothers. The problem is hormonal.

Bleeding gums:

Bleeding gums are often an incidental finding that pregnant women will notice when brushing their teeth. This is a hormonal problem and will resolve after pregnancy.

However, while pregnant, this irritation of the gums needs to be cared for to avoid gingivitis.

The important message here is to know that bleeding gums are observed during the course of a normal pregnancy.

Back Pain:

Back pain during pregnancy (aside from intermittent pain associated with contractions) is quite common. The frontal weight associated with pregnancy causes extreme back strain as the muscles in the back try to compensate to maintain an upright posture and a stable center-of-gravity.

In addition to these musculoskeletal changes, hormonal changes during pregnancy can cause softening and loosening of the ligaments. This can result in unstable joints and lead to nerve entrapment.

low back pain pregnancy

Breast Changes:

Breast milk can leak during your pregnancy due to the physiologic changes caused by increased estrogen. This is often more pronounced with subsequent pregnancies.

Breast enlargement is caused by the development of milk ducts due to increased estrogen. 

Increased pigmentation can occur around the areola.


  • Hyperpigmentation
  • Stretch Marks
  • Worsening acne

Pelvic Girdle Pain and Instability:

Ambulation can become difficult as the pelvic joints become less stable. Progesterone is softening and loosening the ligaments in the pelvis in preparation for childbirth.

Dietary Changes:

As a result of the many hormonal, intestinal and gastric changes, your diet will need to be adjusted to your tolerance level. For those with multiple gestations, the pressure pushing up under your ribs may cause more heartburn which may require you to sleep with your head elevated.

Varicose veins:

This problem can be either an observed physical change or functional change. For some, the superficial varicose veins during pregnancy never cause any functional problems.

However, there can be impaired function when varicose veins develop pain or swelling as a result of inflammation. This can lead to deep or superficial thrombosis (thrombophlebitis/blood clots). With deep vein thrombosis (DVT), there is a need for immediate medical intervention and treatment to prevent further blood clotting (heparin, Lovenox).

The observed physical changes associated with varicose veins involved with phlebitis are the following:

  • Redness
  • Swelling
  • Induration (skin becomes firm)
  • Tenderness
  • Mottled appearance to the color of skin

varicose vein

*Signs of phlebitis must be brought to the attention of your provider immediately as the blood clotting can progress and cause blood clots to go the lung:  pulmonary embolism. (This condition can be life-threatening.)



Constipation is primarily a result of the slowing of the intestinal tract by the hormone called progesterone. Progesterone effects smooth muscle cells which comprise the wall of the colon and are responsible for movement in the intestinal tract.


Urinary frequency:

Urinary frequency can have a few causes during pregnancy. Either from the pressure of the pregnancy on the bladder or from a urinary tract infection.

Concerns about a urinary tract infection must be taken seriously to prevent an infection from ascending  into the upper urinary tract ( kidneys).


Carpal Tunnel Syndrome:

Carpal tunnel syndrome is relatively common during pregnancy due to swelling associated with pregnancy. This swelling can put pressure on the median nerve as it passes through the wrist, resulting in the symptoms associated with Carpal Tunnel Syndrome.

Carpal Tunnel Syndrome

Sciatic Pain:

Sciatic nerve inflammation leading to sciatica can occur due to the same anatomic and physiologic changes attributed to the causes of low back pain. Namely muscle relaxation and loosening of the ligaments.


Heat Intolerance:

Heat intolerance is common during pregnancy, especially during the hot summer months.

In addition, there are many vascular changes that can contribute to heat intolerance.

Every effort should be made to maintain a normal core body temperature during your pregnancy. (This includes staying out of hot tubs, spa and saunas.)


Sensory changes:

There are many women who describe changes in smell and taste during pregnancy.

Since taste is closely associated with one’s ability to smell, it is not surprising that these sensory symptoms may exist together. Many women describe losing their appetite for raw vegetables etc., and others describe the development of cravings (ie. pickles, ice cream).

There is a condition called Pica, where women will develop cravings for strange non-food items. Here is a link to learn more about Pica.


Fatigue during pregnancy is common, in fact, it’s the norm! The following list, are just some of the reasons women experience fatigue as a result of the many material changes in anatomy and physiology previously discussed:

  • Anemia
  • Increased Metabolism
  • Insomnia
  • Decreased Mobility
  • Musculoskeletal Demands
  • Multiple Pregnancies (twins, triplets)
  • Trying to maintain a prepregnancy schedule and not asking for help from family, friends or colleagues.

Fatigue during Pregnancy

Tips to Manage Body Changes during Pregnancy


1. Hydration: Drink plenty of fluids.

Drinking water helps move fluids out of the tissues. Drinking water helps flush out toxins and decreases water retention.

If you can’t stand the taste of plain water, you may want to try infused water with fruits or pregnancy-safe herbs. Drinking lots of fluids will help keep your swelling related to body changes during pregnancy to a minimum.

This is our favorite water infuser: LA Organics Fruit Infuser Water Bottle

Here are a few recipes for infused water you may find helpful:

Hydration in pregnancy

2. Compression Stockings:

Help prevent the pooling of blood in your legs. They feel amazing! They help with swelling and varicose veins. Athletes and runners swear by them and you will too!

compression stockings

3. Moderate Exercise:  Be sure to clear with your provider.

Exercise helps to promote circulation and can help prevent blood clots. Walking and swimming are generally considered safe to do during pregnancy and can help with a host of pregnancy-related symptoms.


4. Reduce Salt Intake:

Most food is prepared with lots of salt, so try to avoid adding salt to your foods.

For more information on swelling during pregnancy: How To Prevent Swelling During Pregnancy



1. Avoid sitting for long periods.

Try to keep moving as much as you can. Moving will help improve circulation to the area.

Try to get some exercise (once you clear it with your provider). Walking, swimming, and prenatal yoga can be good choices.

This is one of the most unpleasant body changes during pregnancy, but getting up and moving can really help minimize it.


2. Stay regular and avoid getting constipated.

This is by far the best thing you can do to avoid hemorrhoids. Drink plenty of fluids and eat more fiber.


3. Take a warm bath.

Soaking in a warm bath may help reduce your discomfort. It has the added bonus of being relaxing!


4. If your hemorrhoids are severe consider using a hemorrhoid donut to alleviate the discomfort.

For more information on hemorrhoids during pregnancy see American Pregnancy Association: Hemorrhoids During Pregnancy: Causes, Treatments, and Preventions 


Bleeding Gums:

1. Though you may experience bleeding, continue to brush your teeth regularly.

Brush twice a day and floss regularly. Try not to be too aggressive with brushing as that can make your gums bleed even more.


2. Use a soft toothbrush.

Make sure your toothbrush is labeled soft and not hard or medium.


3. If you experience discomfort use a toothpaste for sensitive teeth.


4. Maintain routine dental care.

Don’t hesitate to contact your dentist if the bleeding does not diminish or you have concerns about gingivitis (inflammation of the gums). This problem will subside after pregnancy.

For more information on bleeding gums during pregnancy see BabyCenter: Bleeding Gums During Pregnancy


Back Pain:

1. Don’t lift heavy items.

It is easy to forget one’s physical limitations while pregnant. Your ligaments and joints loosen in preparation for childbirth. (Even if you don’t feel it.)

Always bend at your knees to pick up items and divide items up into smaller loads to carry them more safely.

Talk with your provider about using a maternity support belt to give pelvic and low back support by redistributing pregnancy weight. This can be a significant problem when carrying twins or triplets.

maternity support belt

5 Best Pelvic Support Belts



2. Practice relaxation techniques.

You can try meditation. Guided imagery or deep breathing to help you relax.

Relaxing may help relieve your back pain not only caused by musculoskeletal strain but also due to stress and anxiety.



3. Sleep with a pregnancy pillow.

We can’t recommend pregnancy pillows enough! Pregnancy pillows can help you deal with many of the body changes during pregnancy.

Pregnancy pillows provide much-needed support for the tummy, shoulders, back, and legs. Pregnancy pillows can make sleeping on your side more comfortable too.

You can get one here!

pregnancy pillow


For more information about back pain during pregnancy: 8 Ways To Relieve Low Back Pain During Pregnancy



1. Take Naps when you need too.

Pregnancy is very hard. The fatigue you feel is real. Naps are a great way to recharge and reboot yourself.

Fatigue is one the most common body changes during pregnancy, especially during the first trimester, be gentle with yourself and rest when you need too.


2. Eat small, well-balanced meals several times a day.

Try to eat small meals. A large will leave you stuffed and looking for a nap. Try to balance your carbs and proteins. Avoid sugary snacks like candy bars.

They will give you an immediate energy burst but will make you feel even more fatigued just a few hours later.


3. Say “No” and do not feel guilty about it.

Saying “No” can be difficult. If you are feeling fatigued try to limit social outings and errands as much as possible.

Be gentle and flexible with yourself. Your friends and family will understand.

For more information about fatigue during pregnancy: 10 tips To Fight Fatigue During Pregnancy


Varicose Veins:

1. Do not cross your legs while sitting.

This can cause venous stasis and pooling of blood in the lower extremities.


2. During prolonged trips by car or plane, try to stand frequently and walk around.

This will help your muscles contract and return blood to your heart. This helps you avoid developing blood clots.


3. Wear compression stockings.

They really are amazing. They will help reduce swelling due to fluid retention from being on your feet all day. Discuss the right sizing with your provider.

For more info about varicose veins during pregnancy: How To Deal With Varicose Veins During Pregnancy



1. Drink plenty of fluids.

Drink 10 to 12 cups of fluid a day. Drink, water, milk, or sparkling broth. Keep a full water bottle with you at all times. This will help you remember to drink. 


2. Eat a high fiber diet.

Consume 30 grams of fiber a day. Good choices for fiber-filled foods include fruits, vegetables, breakfast cereals, and bread.


3. Eat Plenty of fruits and vegetables.

Bananas, apples, leafy greens, avocados make good choices and can help you avoid constipation which can be one of many common functional body changes during pregnancy.

For more information on preventing constipation during pregnancy see Healthline: 5 Safe Remedies For Constipation In Pregnancy


Carpal Tunnel

1. Rest your hands whenever possible.

Often times, you may not realize how much you use your hands for texting, computer work, etc.. Make a conscious effort to periodically rest your hands.


2. Immobilize your wrist/hand.

This is particularly important if your healthcare provider has performed a neurology exam and diagnosed you with carpal tunnel syndrome.

Immobilization is best achieved by using a wrist brace. Years ago, finding a wrist brace was difficult, now you can often get one at your provider’s office or you can order one online.

There are many to choose from online: Wrist Braces On Amazon


3. Avoid activities that are repetitive and make your symptoms worse.

Though these activities may be routine (typing, cooking, etc.) and never cause you problems. When pregnant, these same activities cause symptoms of carpal tunnel syndrome because the swelling associated with pregnancy puts increased pressure on the median nerve.

For more information about carpal tunnel syndrome during pregnancy: How To Relieve Carpal Tunnel Syndrome During Pregnancy



1. Drink more water.

Drink 8-12 cups of water a day. You can drink juice, milk, and broth too. Be sure to drink pasteurized milk and juice to avoid any type of bacteria that could harm you or your baby.


2. Limit your caffeine intake.

You will want to limit your caffeine to 200mg a day. Caffeine can often be found in drinks like soda, tea, and coffee.


3. Ice pops, popsicles, and Pedialyte pops can help you increase your fluids.

This can be especially true during the first trimester if you have morning sickness. It isn’t uncommon to have morning sickness, food aversions, and fatigue which causes you to not consume enough fluids.


4. Avoid direct heat.

When outside during the hot summer months (beach, boating, etc.), choose shaded areas or use an umbrella. Due to the metabolic changes and dilation of blood vessels, you are more prone to increase your core body temperature.

It is important to keep your core body temperature low, especially during early fetal development. Keep your core temperature low will also help prevent dehydration. 

For more information about dehydration during pregnancy: How To Prevent Dehydration During Pregnancy



Always remember, like so many things you will encounter during the course of your pregnancy (from start to finish), you will be faced with many strong opinions about how to manage various issues (opinions from family, friends, and coworkers).

This is understandable as many people in your life will want to share what worked for them.

The bottom line; however, is to remember that whatever worked for them may not work for you. You may or may not find the information offered to you helpful or you may learn some real gems.

Most important during your pregnancy is to do what you feel is right for you and is supported by your prenatal care provider who is aware of what you should and should not do based on your prenatal course.


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