Intercostal muscle strains don’t usually occur during normal activity. Instead, they are caused by weakened muscles, overexertion, direct trauma such as a fall or car accident, or a blow such as a touch sport like hockey, or repetitive torso twists. Repetitive overuse is also a common culprit—activities like rowing, swimming, or golf that require continuous twisting or forceful torso movement can gradually strain the intercostal muscles over time.

Learn the symptoms and how to manage this common issue by reading on.

What is an Intercostal Strain?

Your intercostal muscle is the muscle between your ribs. It runs between the inner and outer surfaces of the rib cage and is responsible for expanding and contracting your chest. The intercostal muscles have three layers: internal intercostals, innermost intercostals, and external intercostals. 

A strain occurs when the muscle is torn or overstretched. It causes severe pain, stiffness, and swelling in the affected area.

Muscle strains often cause chest pain. Intercostal muscles account for between 21 and 49 percent of all musculoskeletal chest pain.

Different Activities and Intercostal Muscles

Different activities can cause you to pull or strain your intercostal muscles. They include:

  • A direct blow to the rib cage
  • Falling
  • Coughing or sneezing
  • Straining other muscles in the torso, such as those in the abdomen or back
  • Sudden twisting of the torso
  • Sustained bending from waist level
  • lifting while twisting
  • reaching like when you are reaching for overhead items
  • heavy lifting boxes, bags, or purses 

It’s also common to injure these muscles during heavy lifting—especially if you’re lifting weights or objects without proper technique. Even everyday activities like moving furniture or carrying groceries can become risky if you strain and twist at the same time. Sports that involve repetitive torso rotation, such as hockey, golf, or tennis, can also put extra stress on your intercostal muscles, increasing your risk for strain.

If you notice soreness or tightness in your rib area after any of these activities, especially after exertion or sudden movement, you may have strained an intercostal muscle.

The Role of Posture and Core Strength

You might be wondering if slouching at your desk or having a less-than-stellar core could be setting you up for intercostal muscle trouble. The answer is yes—poor posture and weak core muscles can absolutely up your chances of straining those small but mighty muscles between your ribs. Bad posture, like constant hunching or sitting crookedly, places extra pressure on the intercostals. A weak core, meanwhile, fails to support your torso properly, making the intercostal muscles work overtime—especially during sudden movements, heavy lifts, or twisting.

So, whether you’re working from your laptop on the couch or skipping those planks at the gym, both habits could leave your rib muscles more vulnerable to injury. Strengthening your core and being mindful of your posture can go a long way toward keeping those rib muscles happy.

Grades of Intercostal Muscle Strain

Its grade determines the severity of muscle strain.

  • Grad 1: Minimal loss of motion caused by a strain with less than 5 percent damaged muscle fibers. It takes two to three weeks for these injuries to heal.
  • Grade 2: The muscle fibers are severely damaged, but it hasn’t ruptured completely. Having significant muscle loss and needing 2-3 months to heal will significantly cause loss of mobility.
  • Grade 3: The muscle and tendon are entirely torn. In some cases, surgery is required.

What are the Symptoms of Intercostal Muscle Strain?

The symptoms of an intercostal muscle strain are:

  • Tightness of the muscle: Whenever you reach, twist or breathe, the injured muscle may feel tight. 
  • Tenderness: The spot of the strain connecting your ribs will feel sore when it is touched. 
  • Pain: Pain usually occurs with movement and deep breathing. It gets worse during physical activity and increases in intensity within three to five days after you strain the muscle.
  • Swelling: An inflamed muscle will become swollen and painful.
  • Breathing: A muscle strain can make it difficult to breathe. You may feel short of breath and have difficulty taking a deep breath. You may also feel less air moving in and out of your lungs than usual.
  • Sharp or aching pain along the ribs or chest wall: The pain may be felt as a sudden sharp twinge or more of a lingering ache.
  • Pain that worsens with movement: Activities such as twisting, coughing, sneezing, or lifting can make the discomfort much worse.
  • Muscle tightness or spasms around the ribs: You may notice involuntary muscle contractions or a persistent tight feeling in the rib area.
  • Stiffness and reduced mobility in the upper body: Moving your upper body, especially twisting or bending, may feel restricted or uncomfortable.

These symptoms can vary in severity depending on how badly the muscle is strained. Recognizing them early can help you seek proper care and avoid making the strain worse.

When to Suspect a Heart or Lung Problem

While intercostal muscle strain often feels uncomfortable, certain symptoms can signal something more serious—like a heart or lung issue—requiring prompt medical attention. Watch out for the following warning signs:

  • Chest pain that is severe, persistent, or getting worse
  • Trouble breathing or feeling unusually short of breath
  • Pain that radiates from your chest to your arm, shoulder, or jaw
  • Accompanying symptoms like dizziness, sweating, or nausea

If you notice any of these, don’t wait—head to the emergency room right away. These symptoms may indicate a heart attack or another underlying condition that needs immediate evaluation.

What Are the Risks of Not Treating an Intercostal Muscle Strain?

You might be tempted to brush off a sore rib, especially if life is busy. But letting an intercostal muscle strain go untreated isn’t wise—and it can actually lead to bigger problems down the line.

Here’s what can happen if you ignore the pain:

  • Lingering or Chronic Pain: That sharp or aching sensation doesn’t just disappear. It can become persistent, making even simple movements uncomfortable.
  • Recurring Injuries: Without proper healing time, the muscle remains weak and vulnerable. This raises the likelihood of straining it again—sometimes even worse than before.
  • Weaker Ribs and Breathing Problems: The muscles between your ribs play a critical role in helping you take full breaths. Ongoing issues can mean less chest expansion and shallower breathing.
  • Poor Posture: Protecting a sore side often means your body compensates by shifting your posture, which can bring on a whole host of aches in your back, shoulders, and neck.

Getting rest, following proper management (like ice or physical therapy), and easing back into activity will help you avoid these complications and get you moving comfortably again.

How is it Diagnosed

If you feel you have hurt your intercostal muscle (or even feel any pain), you should go to the hospital. To be sure that your intercostal muscle is injured, the attending physician will use some tests.

Your doctor will first conduct a physical exam and ask you different questions. They will ask if you can remember twisting or falling when you first noticed the pain. The physician will like to know if you play any contact sport or sport at all. They will watch out for your response when they touch the tender area. 

Depending on the outcome of the physical exam, your doctor may order a chest x-ray to ensure you have not damaged any other internal organs when you strain the muscle. 

When to Seek Immediate Medical Attention

While intercostal muscle strain is a common cause of chest pain, sometimes chest pain can be a sign of something more serious. You should seek medical attention right away if you experience:

  • Severe or worsening chest pain
  • Shortness of breath or difficulty breathing
  • Pain that radiates to your shoulder, arm, or jaw
  • Dizziness, sweating, or nausea along with chest discomfort

These symptoms could indicate a heart or lung problem rather than a simple muscle injury, and require prompt medical evaluation.

Can Ignoring an Intercostal Muscle Strain Lead to Chronic Pain or Complications?

If you ignore an intercostal muscle strain or continue to push through activities that aggravate it, you may set yourself up for more serious and long-term problems. Without proper care and rest, a simple strain can spiral into chronic pain that lingers far longer than expected.

Some possible complications from neglecting an intercostal strain include:

  • Persistent or recurring pain along your ribcage, making everyday activities uncomfortable.
  • Weakened muscles, which may raise the risk of rib injuries or even fractures down the line, especially if you engage in physical activities or sports.
  • Postural issues—favoring the injured side can lead to imbalances and aches elsewhere.
  • Trouble breathing deeply, as pain may limit how much your chest can expand, reducing overall lung capacity.

To avoid these issues, it’s best to listen to your body, rest as recommended, and follow through with any treatment plan your doctor suggests.

Why Ruling Out Other Causes of Chest Pain Matters

Chest pain can understandably set off alarm bells—it isn’t always just a muscle strain. Sometimes, pain in your chest may signal more serious problems, like heart or lung issues, rib fractures, or an infection. That’s why it’s crucial to investigate further and not simply assume it’s a pulled muscle.

When you visit your doctor, they want to make sure nothing more serious is slipping under the radar. They’ll likely:

  • Ask you about your medical history and how you got hurt.
  • Examine you for signs like swelling, tenderness, or trouble moving.
  • Order imaging tests—like an X-ray, ultrasound, or MRI—if there’s a chance your ribs are fractured or there’s another underlying problem.

It’s best not to gamble with chest pain. Self-diagnosing can miss more dangerous conditions. If your pain is severe, doesn’t make sense, or comes with symptoms like trouble breathing or fever, seek a professional opinion right away.

How Can You Manage it?

When you feel like you have strained your intercostal muscle, you will likely have to schedule an appointment with your doctor. But before you visit your doctor, how do you manage? 

What is the Fastest Way to Heal an Intercostal Muscle Strain?

If you’re wondering how to get back on your feet as quickly as possible, there are a few tried-and-true strategies you can use:

  • Rest: Give your body time to recover. Avoid activities that trigger pain, especially any movements that involve twisting or heavy lifting.
  • Cold and Heat Therapy: In the first 48 hours, applying an ice pack wrapped in a towel for 15-20 minutes at a time can help reduce swelling and numb the pain. After swelling goes down, you can switch to a warm compress to relax the muscles and improve blood flow.
  • Pain Relief: Over-the-counter painkillers like acetaminophen (Tylenol) or NSAIDs such as ibuprofen (Advil) can help ease discomfort, but always talk to your doctor to make sure they’re safe for you.
  • Gentle Stretching: Once the acute pain has improved, gentle stretching exercises—as recommended by your healthcare provider—can help restore flexibility and prevent stiffness.

Recovering from an intercostal muscle strain doesn’t happen overnight, but following these steps can speed up the healing process and reduce your downtime.

Rest and Activity Modification

Giving your body time to recover is essential when dealing with an intercostal muscle strain. While it’s important to avoid any movements or activities—like heavy lifting or intense workouts—that trigger or worsen your pain, you shouldn’t become completely inactive. Gentle movement and light daily activity can actually help reduce muscle stiffness and keep your joints from becoming too tight. The key is to listen to your body: slow down and modify your routine, but don’t stop moving altogether. This balance helps speed up the healing process while minimizing discomfort.

Over-the-counter painkillers

Anti-inflammatories like naproxen (Aleve) or ibuprofen (Advil), or plain pain relievers can help you manage the pain. However, you must ensure you are not overmedicating by consulting your doctor first.  

Stretching Exercises

You can do these exercises at home. Your doctor will also prescribe an exercise program to help you work out the muscles in your chest.  Once the initial pain subsides, gentle guided stretching can help restore flexibility and reduce stiffness. Over time, a physical therapist may introduce strengthening routines designed to prevent reinjury and support overall chest muscle health. Always follow your healthcare provider’s instructions and avoid pushing through sharp pain.

Warm Compress 

A warm wet compress can soothe the pain and reduce inflammation. It may also help get rid of the swelling.

Cardiovascular Exercise

Do cardiovascular exercises to restore blood flow, build muscle, and keep the muscles strong and supple. Activities like walking or gentle cycling can be beneficial once the worst of your pain has subsided. Always listen to your body and avoid pushing through sharp pain.

Returning to Normal Activities

Knowing when to get back to your usual routine after an intercostal muscle strain can be tricky. Generally, it’s best to wait until you can move, breathe deeply, and perform light tasks without pain. If you try to do too much too soon—especially with activities that involve twisting, lifting, or reaching—you may set yourself back and prolong healing.

Gradually ease back into your regular exercises or sports. Start with gentle movements and monitor how your body feels. If you notice any discomfort, take it as a sign to slow down and give yourself more time. Most people find they can return to their usual activities within a few weeks for mild strains, while more severe injuries may require a month or longer. Always check in with your doctor or physical therapist before resuming strenuous activities to ensure you’re not risking reinjury.

Should You Avoid Exercise Completely After an Intercostal Strain?

While it might feel tempting to camp out on the couch and wait for the pain to disappear, complete inactivity isn’t recommended. You should absolutely steer clear of anything strenuous—think running, weightlifting, or high-impact sports—since these can aggravate the injury and delay healing.

However, gentle movement and controlled breathing exercises are actually beneficial as you recover. These activities help maintain flexibility and promote blood flow to the healing area. Your doctor or physical therapist can recommend safe stretches or light activities that won’t put excessive strain on your intercostal muscles.

The key is to listen to your body and gradually ease back into your normal routine. Start slow, avoid pain-triggering movements, and always get a green light from your healthcare provider before ramping things up.

Final Thoughts

It can take as long as 10 weeks for intercostal muscle strains to heal, which can be frustrating. The area may be injected with lidocaine and corticosteroids if you have a painful or swollen strain.

A rib stress fracture is sometimes associated with intercostal muscle strains. In any case, once you’ve been diagnosed with stress fractures, your treatment is unlikely to change. But how can you tell the difference between an intercostal muscle strain and a rib fracture? Generally, a rib fracture tends to cause sharper, more localized pain—often at a very specific spot and made worse with deep breaths or pressure—and may be visible on an x-ray. On the other hand, an intercostal strain is more likely to cause muscle tenderness, a sense of stiffness, and pain that spreads over a wider area of your chest.

Regardless of which injury you have, your overall recovery plan—rest, gentle movement, pain management, and a gradual return to activity—will be quite similar. The focus is on giving your body the time it needs to heal, while following your doctor’s advice and not rushing back into sports or strenuous activities. When you follow your therapy regimen, do your breathing exercises, you’ll feel like yourself again and be able to play again in no time.

It’s essential to warm up before beginning sports or physical activities and not overdo the exercises your body isn’t used to. Taking a few simple steps can lower your risk of intercostal muscle strains and keep you moving comfortably:

  • Warm up and cool down: Always start with gentle stretches or light aerobic activity before jumping into more intense exercise, and finish with a proper cool down.
  • Strengthen your core and upper body: Regularly working on these muscle groups can help support your rib cage and reduce the chance of strain.
  • Use proper lifting techniques: When lifting anything heavy, engage your core and avoid twisting your torso.
  • Mind your posture: Whether you’re sitting at a desk or standing for long periods, maintaining good posture can prevent unnecessary stress on your chest muscles.
  • Manage chronic coughs: Persistent coughing puts repeated strain on your intercostal muscles, so see your doctor for proper management.
  • Take breaks during repetitive activities: If you’re involved in activities like rowing, swimming, or even certain manual jobs, pause regularly to give your muscles a rest.

A little prevention goes a long way—especially if you’re an athlete or your job is physically demanding.

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