7 Weak Core Symptoms to Watch For

What are the symptoms of a weak core?

According to Dr. Driesen Evans, D.C., a weak core often presents lower back pain during prolonged standing or walking, slouching or poor posture, and difficulty balancing on uneven surfaces. When stabilizing core muscles are weak, other parts of the body are forced to compensate, which can lead to joint strain, muscle stiffness, and recurring injuries over time.

When most people hear “core strength,” they think about toned abs or fitness goals. But your core is much more than just its looks (or even just your abs). It includes your abdominal muscles, pelvis, hips, and lower back—and it plays a central role in how your body moves, stabilizes, and protects itself.

When your core isn’t functioning well, other parts of your body often compensate. Over time, that compensation can lead to pain, stiffness, or recurring injuries ¹ (that you probably never imagined could be related to your core). Here are seven common signs your core may be weaker than it should be—and how that weakness could show up as pain.

7 Signs Your Core May Be Weaker Than It Should Be

1. Low Back Pain During Walking or Standing

If your lower back aches when you walk, stand, or run forlong periods, your core may not be providing enough support for your spine. Core muscles act like a natural brace for your lower back—when they’re weak, the spinal joints and surrounding tissues must absorb more stress from the impact of your movements. ² This pattern is commonly associated with back pain, especially in people who sit for long hours or experience repetitive strain. ³

2. Slouching or Difficulty Maintaining Good Posture

A weak core often makes it harder to sit or stand upright without effort. Over time, this can lead to rounded shoulders, forward head posture, and spinal strain. Poor posture doesn’t just affect how you look—it can contribute to posture-related pain, neck pain, and even tension-based headaches.

3. Needing Your Arms to Stand Up from a Chair

If you regularly push off your thighs or armrests to stand, your core and hip stabilizers may not be doing their job. When they underperform, it places extra strain on the knees, hips, and lower back. This is especially important to be aware of, as it can be a sign of declining stability.

This symptom often overlaps with joint pain or mobility limitations, especially as we age—if we don’t stay active and take proper care of our spine and other joints.

4. Trouble Balancing or Walking on Uneven Surfaces

Balance relies heavily on deep core muscles that help control movement and stability. Difficulty standing on one leg or navigating uneven ground may indicate that those stabilizing muscles aren’t firing properly.

This is especially common after accidents or injuries, when the body adapts protective movement patterns that weaken the core over time (most of us are familiar with this; think about a time when you were injured and you favored one side over the other, or changed the way you stood, sat, or walked).

5. Digestive Discomfort or Difficulty Bearing Down

While digestion involves many systems, your core muscles also play a role in internal pressure and pelvic stability. Weakness in this area can contribute to discomfort during bowel movements or feelings of abdominal instability.

This is particularly relevant during and after pregnancy, when the core must adapt significantly—often a cause of pregnancy-related pain, as pregnancy is a time when a strong core and good spinal support are especially important.

6. Plateaued Strength Gains Despite Working Out

If you’re exercising regularly but struggling to build overall strength, core instability may be limiting your progress (who knew?!). Without a stable base, your body can’t efficiently transfer force during movement.

This can also increase strain on the shoulders, wrists, and hands—sometimes contributing to conditions like carpal tunnel syndrome.

7. Holding Your Breath During Core Exercises

Holding your breath during planks or other core exercises is a common sign of poor neuromuscular control. Instead of coordinating muscle engagement, your body is relying on tension to get through the movement (we’ve all been there).

Over time, this pattern can increase strain on the neck and jaw, sometimes aggravating jaw pain or TMJ-related symptoms—which sounds strange until you remember that every muscle and nerve in the body is interconnected. That’s also why improving your spinal health can have such far-reaching effects.

How to Start Improving Core Strength Safely

Core strength isn’t built overnight. It requires proper movement patterns, gradual progression, and exercises that match your body’s current capabilities.

Popular core exercises include:

• Planks (and modified planks)
• Bridges
• Dead bugs
• Controlled rotational movements (CARs): active, slow, and deliberate rotational movements designed to maximize a joint’s functional range of motion and improve joint health.

Because everyone’s body is different, it’s important to avoid pushing through pain or using exercises that don’t suit your needs—especially if you’re already dealing with pain or recovering from an injury.

How Chiropractic Care Supports Core Strength

Chiropractic care plays an important role in supporting core stability by addressing spinal alignment, joint mobility, and posture.

“A strong core isn’t simply the result of harder training; it’s the result of better movement! Efficient core function relies on coordinated interaction between the spine, pelvis, nervous system, and surrounding musculature. When joint motion is restricted or movement quality is impaired, muscles often compensate with altered activation patterns reducing efficiency and increasing tissue stress.” — Dr. Drisen Evans, D.C

When joints are restricted or misaligned, surrounding muscles—including core muscles—can become overworked, underworked, or stuck at an inefficient resting length. Chiropractic adjustments and active rehabilitative therapies help restore full and proper motion, allowing core muscles to engage more effectively.

In addition, chiropractic care often includes movement guidance and posture education, which can reduce strain on the spine and help prevent recurring pain patterns linked to core weakness. A strong core supports your entire body. If you’re experiencing pain, balance issues, or postural changes, addressing core stability—along with spinal health—can make a meaningful difference in how you move and feel every day.

Book your chiropractic visit and take the first step toward better stability, strength, and long-term comfort.

Frequently Asked Questions (FAQs)

How does a weak core cause back pain?

Your core acts as a natural brace that supports your spine. When these muscles are weak, the burden of absorbing impact during activities like walking or standing falls directly on your spinal joints and lower back tissues, resulting in strain and pain over time.

Can a chiropractor help me strengthen my core?

Yes. While chiropractors don’t perform your exercises for you, they optimize your body’s mechanics. By correcting spinal misalignments and restoring proper joint mobility, chiropractic care allows your core muscles to engage efficiently. Your care plan may also include targeted active therapies and prescribed exercises to help build long-term stability.

Are core exercises safe if I already have lower back pain?

Yes, but the type of exercise matters. If you are experiencing active back pain, you should avoid high-strain movements like full sit-ups or heavy twisting. Instead, start with gentle, spine-neutral stabilization exercises like modified planks or bridges. It is highly recommended to consult a doctor of chiropractic before starting a new routine to ensure you aren’t aggravating an underlying issue.

How do I know if my pain is from a weak core or a spinal injury?

A weak core often presents a dull, aching fatigue in the lower back after prolonged standing, sitting, or walking. However, if you experience sharp, shooting pain, numbness, or tingling that travels down your legs, it may indicate a structural spinal issue, such as a herniated disc or sciatica. A comprehensive chiropractic exam can pinpoint the exact root cause of your symptoms.

How long does it take to fix a weak core?

Building core strength is a gradual process. With consistent, targeted exercises and proper spinal alignment, many people begin to feel improvements in their stability and a reduction in postural pain within 4 to 8 weeks. Long-term functional strength requires ongoing maintenance and proper movement habits.

References

1. Huxel Bliven, K. C., & Anderson, B. E. (2013). Core Stability Training for Injury Prevention. Sports Health: A Multidisciplinary Approach, 5, 514–522.
2. Hlaing, S. S., Puntumetakul, R., Khine, E. E., & Boucaut, R. (2021). Effects of core stabilization exercise and strengthening exercise on proprioception, balance, muscle thickness and pain related outcomes in patients with subacute nonspecific low back pain: a randomized controlled trial. BMC Musculoskeletal Disorders, 22.
3. Frizziero, A., Pellizzon, G., Vittadini, F., Bigliardi, D., & Costantino, C. (2021). Efficacy of Core Stability in Non-Specific Chronic Low Back Pain. Journal of Functional Morphology and Kinesiology, 6(2), 37.