Third Trimester Discomforts: Causes, Relief, and When to Call a Doctor

The third trimester is exciting and challenging at the same time. Your baby is growing quickly, your body is working harder than ever, and a long list of new aches and pains can appear as you get closer to labor.

This comprehensive guide walks through the most common third-trimester discomforts, why they happen, safe relief strategies, and when to call your healthcare provider. It is for education only and does not replace personalized medical advice.

Overview of Third Trimester Discomforts

Most third-trimester symptoms are the result of your growing uterus, hormonal shifts, increased blood volume, and the baby’s changing position. These changes can affect muscles, ligaments, digestion, breathing, circulation, and sleep.

While many discomforts are normal, sudden changes, severe pain, heavy bleeding, or symptoms that feel worrisome always deserve a call to a healthcare professional.

• Common issues include back pain, pelvic pressure, heartburn, constipation, leg cramps, swelling, shortness of breath, and trouble sleeping.
• Self-care, good posture, hydration, movement, and practical comfort strategies often ease symptoms, but they may not eliminate them completely.

Back Pain and Pelvic Pressure

As the uterus grows, your center of gravity shifts, abdominal muscles stretch, and ligaments loosen under the influence of pregnancy hormones. This combination often leads to lower back pain and a sense of heaviness or pressure in the pelvis.

The baby’s head settling deeper into the pelvis late in the third trimester can intensify pelvic pressure, especially when walking, standing for long periods, or climbing stairs.

Tips to Relieve Back and Pelvic Discomfort

• Practice good posture: keep shoulders relaxed and hips aligned under the rib cage when standing.
• Use a pregnancy support belt to help take pressure off the lower back and abdomen.
• Sleep on the side with a pillow between the knees and another under the belly for extra support.
• Avoid lifting heavy objects and bend at the knees, not the waist.
• Gentle prenatal yoga, stretching, or swimming can strengthen supportive muscles and reduce pain.

Round Ligament and Abdominal Discomfort

The ligaments that support the uterus stretch significantly in late pregnancy. This can cause brief, sharp pains on one or both sides of the lower abdomen, especially when changing positions, coughing, or standing up quickly.

General abdominal tightness may also occur as the uterus presses on surrounding organs, leaving the area feeling sore, stretched, or full.

Comfort Strategies

• Stand up slowly and avoid sudden twisting motions.
• Use a warm (not hot) compress on the lower abdomen for short periods to ease muscle tension.
• Support the belly with hands or a belly band when coughing, laughing, or changing positions.
• Wear loose clothing to avoid extra pressure across the abdomen.

Braxton Hicks Contractions vs. True Labor

Many pregnant people notice irregular, usually painless tightenings of the uterus in the third trimester. These are often called Braxton Hicks contractions and are sometimes described as the uterus “practicing” for labor.

True labor contractions become progressively stronger, closer together, and more regular over time, whereas Braxton Hicks tend to remain irregular and may ease with rest or hydration.

Ways to Ease Braxton Hicks

• Drink water; mild dehydration can make practice contractions more noticeable.
• Change positions: if standing, sit or lie on the side; if lying, get up and walk gently.
• Take slow, steady breaths to relax abdominal muscles and reduce tension.
• Use a warm shower to soothe general muscle discomfort.

Heartburn and Indigestion

Heartburn is one of the most common third-trimester complaints. Hormones relax the valve between the esophagus and stomach while the growing uterus pushes upward, allowing stomach acid to move up more easily.

This can cause a burning sensation in the chest or throat, sour taste in the mouth, or a feeling of food sitting heavily after meals.

Heartburn Relief Tips

• Eat small, frequent meals and avoid lying down within two to three hours after eating.
• Limit very spicy, greasy, or acidic foods that tend to trigger symptoms.
• Prop the upper body up with pillows or a wedge when sleeping.
• Wear loose clothing around the waist to reduce pressure on the stomach.
• Ask a healthcare professional which antacids or medications are safe during pregnancy.

Constipation and Hemorrhoids

Slowed digestion, iron supplements, and pressure from the uterus on the intestines make constipation very common late in pregnancy. Straining during bowel movements can lead to or worsen hemorrhoids, which are swollen veins in the rectal area.

Hemorrhoids may cause itching, pain, or bright red blood on toilet paper. While usually not dangerous, they can be very uncomfortable.

Supporting Digestive Health

• Increase fiber intake with fruits, vegetables, whole grains, and beans.
• Drink plenty of water throughout the day to soften stools.
• Stay active with walking or gentle exercise to stimulate bowel movements.
• Avoid prolonged straining; respond to the urge to go rather than delaying.
• Discuss stool softeners, fiber supplements, or topical treatments with a healthcare professional.

Shortness of Breath

As the uterus expands upward, it can limit how far the diaphragm can move, making it feel harder to take a deep breath. This is especially noticeable when climbing stairs, carrying items, or lying flat on the back.

Later, when the baby “drops” into the pelvis before birth, some people notice breathing becomes a bit easier again but pelvic pressure may increase.

Breathing Easier

• Maintain good posture to give the lungs as much room as possible.
• Sleep propped up with pillows or on the side instead of flat on the back.
• Take breaks during physical activity and move at a comfortable pace.
• Practice slow, deep breathing exercises to help the body adjust to the sensation.

Swelling of Feet, Ankles, and Hands

Mild swelling in the lower legs, ankles, and feet is common in the third trimester because blood volume and fluid retention are higher and the uterus can press on veins returning blood from the legs.

Hands may also feel puffy or tight, especially at the end of the day or in warmer weather.

Managing Normal Swelling

• Elevate the feet when sitting and avoid crossing the legs at the knees.
• Wear comfortable shoes and consider supportive stockings if recommended.
• Stay active with gentle walking to support circulation.
• Limit long periods of standing in one place.
• Drink enough water; adequate hydration actually helps the body balance fluids.

Fatigue, Sleep Problems, and Insomnia

Finding a comfortable sleep position can be difficult late in pregnancy due to a large belly, back pain, heartburn, frequent bathroom trips, and active baby movements at night. Many people also experience racing thoughts or anxiety about labor and parenthood.

This combination often leads to fragmented sleep, long wakeful periods, or insomnia in the third trimester.

Better Sleep Habits in Late Pregnancy

• Use multiple pillows: one between the knees, one supporting the belly, and one behind the back.
• Develop a calming bedtime routine such as a warm shower, gentle stretching, or reading.
• Avoid large meals and heavy fluids right before bed to reduce nighttime heartburn and bathroom visits.
• Limit screens close to bedtime to help the mind wind down.
• Talk with a healthcare professional before taking any sleep aids or herbal remedies.

Frequent Urination and Bladder Pressure

As the baby settles lower in the pelvis, pressure on the bladder increases. This can lead to needing to urinate more often, including waking multiple times at night.

Small leaks of urine may occur when coughing, laughing, sneezing, or lifting, which can be frustrating but is usually temporary.

Practical Tips for Bladder Comfort

• Lean slightly forward when urinating to help empty the bladder more fully.
• Limit caffeine, which can irritate the bladder and increase urgency.
• Use panty liners or pads if leaks are frequent for comfort and confidence.
• Do pelvic floor (Kegel) exercises if cleared by a healthcare professional.

Leg Cramps and Restless Legs

Sharp calf cramps or an irresistible urge to move the legs at night are common late in pregnancy. Circulation changes, muscle fatigue, and mineral shifts may all play a role.

These sensations can disrupt sleep and add to overall fatigue.

Soothing Leg Discomfort

• Gently stretch the calves before bed and after long periods of sitting.
• Flex the foot upward (toes toward the knee) during a cramp and massage the muscle.
• Stay hydrated and discuss calcium, magnesium, or iron levels with a healthcare professional if cramps are frequent.
• Use warm baths or heating pads on a low setting for tired muscles.

Breast Changes and Leakage

By the third trimester, breasts are often larger, more tender, and may leak small amounts of colostrum, the early form of breast milk. Nipples and areolas can become darker and more sensitive.

These changes are a sign that the body is preparing for feeding the baby after birth.

Comfort Measures for Breast Changes

• Wear a well-fitting, supportive bra without underwire if that feels more comfortable.
• Use cotton breast pads if leakage is frequent to keep clothing dry.
• Choose soft fabrics that do not rub or irritate the nipples.

Emotional Ups and Downs

Hormonal shifts, physical discomfort, and anticipation of birth often lead to mood swings in the third trimester. Feelings can range from excitement and impatience to worry and irritability.

Occasional low days are common, but persistent sadness, hopelessness, or anxiety that interferes with daily life deserves professional support.

Caring for Emotional Wellbeing

• Talk openly with a partner, friend, or support person about fears and expectations.
• Attend childbirth or parenting classes to feel more prepared.
• Use relaxation techniques like deep breathing, meditation, or gentle stretching.
• Reach out to a healthcare professional or therapist if mood changes feel overwhelming.

Warning Signs: When to Call Your Healthcare Provider

Most third-trimester discomforts are normal, but some symptoms can signal complications that need urgent attention. It is always better to ask than to wait if something feels wrong.

Seek medical care right away (emergency services if necessary) for any severe or sudden symptoms.

• Vaginal bleeding, sudden fluid gush or persistent leaking that may be amniotic fluid.
• Severe abdominal pain, especially if it does not ease with rest.
• Strong, regular contractions before 37 weeks or contractions accompanied by back pain and pelvic pressure that do not go away.
• Severe headache, vision changes, sudden swelling of face or hands, or pain under the ribs.
• Fever, chest pain, severe shortness of breath, or decreased baby movements.

Frequently Asked Questions (FAQs)

1. Are all third-trimester pains normal?

Many aches, such as mild back pain, pelvic pressure, and occasional Braxton Hicks contractions, are a typical part of late pregnancy. However, pain that is intense, steady, or accompanied by bleeding, fever, or other worrisome symptoms should always be checked by a healthcare professional.

2. How can I tell if I am in real labor?

Real labor contractions usually become stronger, longer, and closer together over time, and they do not stop with rest or hydration. If contractions follow a regular pattern, are happening every few minutes over an extended period, or are painful enough that talking through them is difficult, contact a healthcare provider or birth facility for guidance.

3. Is it safe to exercise with third-trimester discomforts?

Light to moderate exercise approved by a healthcare professional—such as walking, swimming, or prenatal yoga—often helps relieve back pain, swelling, constipation, and stress. Activities should be adjusted as pregnancy progresses, and exercise should be stopped immediately if dizziness, bleeding, chest pain, or severe discomfort occurs.

4. What can I take for pain during late pregnancy?

Pain-relief options depend on individual health history and pregnancy details. Never start or stop any medication, including over-the-counter pain relievers, without checking with a healthcare professional who knows your specific situation.

5. Will these discomforts go away after birth?

Many discomforts—such as heartburn, shortness of breath, and bladder pressure—improve quickly once the uterus begins to shrink after delivery. Others, like back pain or hemorrhoids, may take longer to resolve and benefit from ongoing self-care and follow-up with healthcare professionals.

The third trimester can be physically demanding, but understanding what is normal, how to ease common discomforts, and when to seek help can make this final stretch of pregnancy more manageable and reassuring.