Liver pain can absolutely feel like a pulled muscle, and this confusion sends people down the wrong track more often than you might expect. The liver itself has no pain-sensing nerve fibers inside its tissue. Instead, pain signals come from the thin membrane wrapped around it, called Glisson’s capsule, which stretches or becomes inflamed when the liver swells. That stretching produces a dull, aching, or pulling sensation in the right upper abdomen that many people describe in muscular terms. Making matters worse, the brain processes visceral pain from organs and somatic pain from muscles through overlapping neural circuits, which blurs the line between the two experiences even further.
Why Liver Pain Feels Muscular in the First Place
The liver sits under the right ribcage and overlaps with the attachments of the diaphragm, the intercostal muscles, and the upper portion of the abdominal wall. When Glisson’s capsule is stretched by a swollen or enlarged liver, the aching sensation it generates radiates into the same zone where you would feel a strained oblique or a sore rib. The character of the pain adds to the confusion. Capsular stretch tends to be dull, constant, and worsened by certain body positions or deep breathing, all of which are also hallmarks of a muscle strain in the same area.
Brain imaging research helps explain why distinguishing these sensations is so hard. A study comparing how the brain responds to visceral pain versus skin-level pain found that both activate a similar core network, including the thalamus, secondary somatosensory cortex, and cerebellum. However, visceral pain activated different subregions within the primary somatosensory cortex and the anterior cingulate cortex compared to cutaneous pain, while cutaneous pain lit up the anterior insular cortex more strongly.1PubMed. Differentiation of visceral and cutaneous pain in the human brain In plain terms, the two types of pain share enough neural real estate that the brain struggles to label one as “organ” and the other as “muscle.” The result is that many people genuinely cannot tell whether the aching under their right ribs is coming from inside or from the body wall.
This overlap is not just an academic curiosity. Visceral pain is now recognized as a distinct pain type with its own neurochemistry, different in meaningful ways from the pain of a sprained ankle or a sore back.2PubMed Central. Drug management of visceral pain: concepts from basic research Yet because people experience it through the same body regions where muscles live, it gets mislabeled constantly.
Liver Conditions That Produce a Muscle-Like Ache
Several liver problems generate the kind of dull right-sided ache or pulling sensation that people compare to a strain. The mechanism is almost always the same: something causes the liver to swell, which stretches the capsule and triggers pain receptors in that outer membrane.
Viral hepatitis is one of the more common culprits. When the liver becomes inflamed during an acute hepatitis infection, patients often report pain in the right upper quadrant of the abdomen caused by swelling of the liver and its surrounding capsule. That pain can arrive alongside flu-like symptoms, fatigue, and loss of appetite, which may further confuse the picture because a bad viral illness with body aches can make the whole right side feel sore.3Oxford Medicine Online. Viral hepatitis
Nonalcoholic fatty liver disease is trickier because most people with it feel nothing at all. The liver accumulates fat gradually, and the organ can become substantially enlarged before anyone notices. Among those who do have symptoms, the most frequently reported complaints are fatigue and right upper quadrant pain.4PubMed. Nonalcoholic Fatty Liver Disease Because the onset is slow and the pain is mild, it is easy to chalk it up to sleeping in a funny position or overdoing it at the gym.
Hepatic cysts offer a more dramatic example of capsular stretch. A case report described a patient with a massive liver cyst measuring roughly 17 by 14 by 18 centimeters whose pain was severe enough to require opioid-level medication. The pain was attributed to stretching of Glisson’s capsule, and when doctors drained about 2.5 liters of fluid from the cyst, the pain resolved.5PubMed Central. Hepatic Cyst: An Unusual Suspect of Syncope Most cysts are small and cause no symptoms, but when they grow large enough to distend the capsule, the aching can be intense and persistent.
Cirrhosis changes the capsule itself. Research on liver capsules from patients with cirrhosis found that the capsule becomes structurally weaker, requiring less force to deform and break compared to healthy tissue.6ScienceDirect (JHEP Reports). Glisson’s capsule matrix structure and function is altered in patients with cirrhosis irrespective of aetiology A weaker, altered capsule may respond differently to the mechanical stresses of daily movement, potentially contributing to the chronic discomfort many cirrhosis patients describe.
When a Muscle Problem Mimics the Liver
The confusion runs in both directions. Just as liver problems can feel muscular, genuine musculoskeletal issues in the right upper abdomen can feel like something is wrong with an organ. This leads to unnecessary imaging, blood tests, and anxiety.
Myofascial pain syndrome involving the abdominal rectus or oblique muscles is a well-documented mimic of visceral disease. Trigger points in these muscles produce pain that can be located in the same quadrant as the liver, and the referred pain from these trigger points can even radiate to different quadrants or to the lower back, making the picture even muddier.7Revista Dor. Abdominal visceral pain: clinical aspects A person with a knot in their right oblique might be convinced their liver is the problem, especially if they have risk factors like heavy alcohol use or obesity that prime them to worry about liver disease.
Abdominal wall pain has its own patterns. A study examining patients with chronic abdominal wall pain found that the majority had small, localized painful spots along the lateral edge of the rectus muscle, with pain that intensified when the abdominal muscles were contracted. Some patients had pain along the costal arch, right at the lower rib margin where the liver sits, and pain within the rectus muscle was linked to exercise.8PubMed. Abdominal wall pain–classification, diagnosis and treatment suggestions These are straightforward musculoskeletal problems, but their location means they overlap perfectly with where liver pain would be felt.
Slipping rib syndrome is another overlooked cause. The lower ribs can become hypermobile and slip over each other, producing upper abdominal or low thoracic pain that gets blamed on the organs behind them. The condition is frequently missed, and researchers have suggested that imaging of the rib margin should be part of the workup when abdominal pain has no clear source.9PubMed. Slipping rib syndrome: a place for sonography in the diagnosis of a frequently overlooked cause of abdominal or low thoracic pain If you have sharp or clicking pain along the lower right rib cage that changes with posture or twisting, this is worth considering before jumping to liver conclusions.
The Shoulder Clue Most People Miss
One of the more reliable hints that right upper abdominal pain is coming from the liver rather than from a muscle is referred pain in the right shoulder. This happens because the diaphragm, which sits directly on top of the liver, is supplied by the phrenic nerve. That nerve originates from the same spinal levels (C3 through C5) that send sensory branches to the skin over the shoulder. When the liver swells and presses against the diaphragm, pain signals travel up the phrenic nerve and the brain misinterprets them as shoulder pain.10PubMed. “Pes anserinus” of the right phrenic nerve innervating the serous membrane of the liver: a case report (anatomical study)
This referred shoulder pain is not subtle background discomfort in every case. A report of a patient with liver metastases described significant shoulder pain as the presenting symptom, with the mechanism traced to tumor-related irritation of the diaphragm sending signals through the phrenic nerve to the shoulder region.11PubMed Central. Liver Metastasis: A Rare and Sinister Cause of Shoulder Pain A pulled muscle in the abdomen does not cause shoulder pain. So if you have a dull ache under the right ribs accompanied by an unexplained soreness at the tip of your right shoulder, the combination points toward a liver or diaphragm issue rather than a strain.
A Simple Test to Help Tell the Difference
There is a bedside maneuver called Carnett’s test that clinicians use to sort abdominal wall pain from visceral pain.12PubMed. The Diagnostic Value of Carnett’s Test with Chronic Abdominal Pain: A Narrative Review The idea is straightforward. A doctor presses on the tender spot while you are lying relaxed. Then you tense your abdominal muscles, usually by lifting your head or legs off the table. If the pain stays the same or gets worse when the muscles are contracted, the problem is in the abdominal wall itself, because tightening the muscles compresses a nerve or trigger point. If the pain decreases when you tense up, the source is deeper, likely an organ, because the contracted muscle wall acts as a shield between the examiner’s fingers and whatever is inflamed underneath.
You can try a rough version at home. Lie flat, find the sore spot with your fingertips, and press firmly. Then do a partial sit-up crunch to engage the abs and press again. If the pain jumps up during the crunch, the wall is almost certainly the culprit. If it fades, something beneath the wall deserves investigation. This is not a replacement for a medical evaluation, but it can help you have a more productive conversation with your doctor about what is going on.
When the Liver Gets Blamed and Shouldn’t
Right upper quadrant pain with slightly abnormal liver blood tests creates a strong pull toward a liver diagnosis, and in many cases, that instinct is correct. But clinicians have reported situations where extensive hepatobiliary workups come back negative, and the real answer lies elsewhere. A case series published in a surgical journal noted that after multiple negative liver-focused tests, the diagnosis needed to shift toward referred pain from other structures, including the spine, the chest wall, or even the gallbladder.13PubMed Central. Right upper quadrant pain and raised alkaline phosphatase is not always a hepatobiliary problem
Gallbladder disease is a common neighbor that muddies the diagnostic picture. The gallbladder sits tucked underneath the liver, and inflammation or stones can produce pain that feels identical to liver capsule stretch. Research on patients with gallbladder pathology found that painful gallbladder disease generates referred tenderness and tissue changes in nearby areas, with the extent of the referred symptoms scaling with how much pain the patient perceives.14PubMed. Relationship between pain symptoms and referred sensory and trophic changes in patients with gallbladder pathology In other words, a bad gallbladder can make the entire right upper abdomen tender, and the spreading soreness can feel remarkably like a pulled muscle across the area.
Thoracic spine problems, rib fractures, and even right lower lung pathology can also refer pain to the right upper abdomen. The take-home point is that the location alone does not clinch the diagnosis. A pain that persists despite rest and position changes, that worsens after eating fatty foods, or that comes with shoulder involvement should prompt investigation beyond a simple “I must have pulled something.”
Exercise-Related Abdominal Pain and the Confusion It Creates
Anyone who runs, swims, or does high-intensity cardio has probably felt the sharp stitch or deep ache in the upper abdomen during exercise. This phenomenon, called exercise-related transient abdominal pain, is extremely common and most often felt in the right side. When it is severe, sufferers describe it as sharp or stabbing. When it is milder, it feels cramping, aching, or pulling, language almost identical to how people describe a muscle strain or liver discomfort.15PubMed Central. Exercise-Related Transient Abdominal Pain (ETAP)
In surveys of athletes, about three-quarters of those who experienced this pain during exercise had to slow down, and roughly one in ten had to stop entirely. When people get this pain repeatedly on the right side, it can seed a worry that something is wrong with their liver, especially if they already have liver-related anxiety due to lifestyle factors. In almost all cases, the pain resolves within minutes of stopping exercise and does not represent any organ damage. But if a pulling, aching right-sided pain shows up only during exertion and vanishes at rest, exercise-related abdominal pain is a far more likely explanation than liver disease.
When Chronic Sensitivity Lowers the Threshold
Some people develop a heightened sensitivity to normal internal sensations, a process researchers have studied extensively in the context of functional gastrointestinal disorders. The concept of visceral hypersensitivity means that signals from the gut and surrounding organs, which would normally fly below the radar, get amplified by the central nervous system and registered as pain.16PubMed Central. Central sensitisation in visceral pain disorders For someone with this kind of sensitization, a mildly distended liver or a slightly inflamed capsule might generate pain out of proportion to what imaging or blood work would predict.
This helps explain why some people with completely normal liver scans and normal blood tests continue to report a pulling, aching sensation under the right rib cage. The signal is real, not imagined, but the amplification is happening in the spinal cord and brain rather than because of progressive tissue damage. Stress, poor sleep, and prior painful episodes in the same region can all contribute to this kind of central sensitization. If you have been thoroughly evaluated for liver disease and everything checks out, this process is worth discussing with your doctor, because the treatment approach shifts from organ-focused investigation to pain-management strategies aimed at calming the nervous system.
Practical Signals Worth Paying Attention To
Given how easily liver pain and muscle pain get tangled up, a few practical distinctions can help you decide when to seek medical attention rather than reaching for a heating pad:
- Timing after meals: Pain that flares within an hour of eating, especially fatty food, points toward the liver or gallbladder. A pulled muscle does not care what you ate.
- Shoulder involvement: An ache at the tip of the right shoulder, with no shoulder injury to explain it, suggests diaphragmatic irritation from the liver area.
- Response to muscle contraction: Pain that eases when you tense your abs suggests a deeper, visceral source. Pain that worsens points to the wall itself.
- Duration and trajectory: A muscle strain improves steadily over days to weeks with rest. Liver-related pain tends to be more constant, or may fluctuate with eating, alcohol intake, or medication use rather than physical activity.
- Associated symptoms: Nausea, dark urine, pale stools, yellowing of the skin or eyes, unexplained fatigue, or easy bruising all suggest a liver issue rather than a musculoskeletal one.
None of these clues is definitive on its own. But the pattern they form together usually points clearly enough in one direction to guide the next step, whether that is watchful waiting, a visit to your primary care doctor, or a trip to the emergency room.