A pulsating sensation under the right rib cage usually reflects one of a handful of causes: your own heartbeat transmitted through the liver, a muscular twitch in the diaphragm or intercostal muscles, increased blood flow after eating, or, less commonly, a vascular abnormality that genuinely needs medical attention. Most people who notice this feeling are sensing something real but harmless, though the location makes it unsettling because the liver, gallbladder, and several large blood vessels all sit in that area.
Why You Can Feel a Pulse in That Spot
The right upper quadrant of the abdomen is one of the few places where you can sometimes feel your heartbeat without touching your chest. The liver, the largest solid organ in the body, sits directly beneath the right rib cage and is draped over the inferior vena cava and positioned near the abdominal aorta. Every heartbeat sends a pressure wave through those vessels, and the liver can transmit that pulse like a drum skin. In thin or lean individuals, this transmitted pulsation is often visible and entirely normal. One case report noted that even in patients without aneurysms, normal aortic pulsation can sometimes be seen through the abdominal wall in thinner people.
If you lie flat on your back after exercise, during a period of dehydration, or when your heart rate is elevated from caffeine or stress, the pulsation becomes more noticeable because the heart is pumping harder and the pulse pressure is wider. This version of the feeling tends to come and go, matches your heart rate if you check, and does not cause pain. It is the single most common explanation for the sensation and rarely warrants any investigation.
Tricuspid Regurgitation and Pulsatile Liver
When the pulsation under the right rib cage is genuinely abnormal and not just your own heartbeat felt more strongly than usual, one of the more recognized causes involves the heart’s tricuspid valve. The tricuspid valve sits between the right atrium and right ventricle. If it does not close properly, blood leaks backward with each heartbeat into the venous system, and that backward surge travels down the inferior vena cava directly into the liver. The result is a liver that visibly and palpably pulses in time with the heartbeat, sometimes strongly enough that a doctor can feel it during a physical exam.
A case report described a patient with a tender, pulsatile mass in the upper abdomen that was initially suspected to be an abdominal aortic aneurysm but turned out to be a congested liver caused by progressive tricuspid valve regurgitation and right-sided heart failure.1PubMed Central. A Tender Pulsatile Epigastric Mass is NOT Always an Abdominal Aortic Aneurysm: A Case Report and Review of Literature The distinction matters because the treatments are completely different. An aortic aneurysm may need surgical repair, while a pulsatile liver from tricuspid regurgitation points to heart failure management. The pulsating feeling from tricuspid regurgitation is usually accompanied by other signs of right heart failure: swollen ankles, a distended abdomen, fatigue, and sometimes visible neck vein distension. If the pulsation is painless and you have none of those other symptoms, this is unlikely to be the explanation.
Blood Vessel Abnormalities in or Near the Liver
The liver has a rich blood supply from both the hepatic artery and the portal vein, and abnormalities in those vessels can occasionally produce a pulsating feeling or a palpable mass under the right rib cage.
Hepatic artery aneurysms are rare but have been documented as a cause of right upper quadrant pain with a palpable, sometimes pulsating mass. One reported case involved a middle-aged woman who presented with right upper quadrant pain and a palpable mass that turned out to be a thrombosed hepatic artery aneurysm.2International Journal of Clinical Practice. HEPATIC ARTERY ANEURYSM: AN UNUSUAL PRESENTATION Pseudoaneurysms of the hepatic artery, which can form after liver biopsies or other procedures, have also been identified on imaging as abnormal vascular structures in the right upper quadrant.3PubMed Central. Iatrogenic arterio-biliary fistula and peripheral hepatic artery pseudoaneurysm after transjugular liver biopsy These are not something you would develop spontaneously without a preceding injury, procedure, or underlying vascular disease, so the context matters when evaluating whether vascular pathology could be responsible.
Hepatic arteriovenous malformations, where an abnormal connection forms between an artery and a vein inside the liver, are another rare vascular cause. These can produce a hyperdynamic blood flow through the liver that contributes to high-output heart failure in severe cases.4Clinical Case Reports. Hepatic arteriovenous malformation A doctor might hear a bruit (an abnormal whooshing sound) over the liver with a stethoscope, which is a clue that blood is flowing turbulently through an abnormal connection.
Abdominal aortic aneurysms, while typically felt more centrally in the abdomen rather than under the right rib cage specifically, deserve mention because a large one can produce a pulsatile mass that extends across the upper abdomen. A case report described a patient with a grossly visible, broad pulsatile mass in the periumbilical region consistent with a large aneurysmal dilation, distinguishable from normal aortic pulsation by its width and prominence.5PubMed Central. Pulsating Evidence: Clinical Visualization of an Abdominal Aortic Aneurysm If you are feeling a broad, forceful pulse across the middle or upper abdomen rather than a localized flutter under the right ribs, that warrants prompt evaluation.
Diaphragm Spasms and Muscle Twitches
Not everything that pulses under the ribs involves the heart or blood vessels. The diaphragm, the dome-shaped muscle that sits directly beneath the rib cage and powers your breathing, can twitch involuntarily, and those twitches can feel exactly like a pulsation. The sensation is rhythmic, localized, and sometimes visible through the skin, which is why people often mistake it for a vascular pulse.
Diaphragmatic myoclonus is a rare motor disorder characterized by involuntary, rhythmic, repetitive contractions of the diaphragm and other respiratory muscles.6PubMed Central. Diaphragmatic myoclonus post cerebellar hemorrhage: a case report It involves involuntary movements of the abdominal wall and can follow neurological events like strokes or hemorrhages, though it can also occur without a clear neurological trigger. The rhythm of diaphragmatic myoclonus is typically faster or slower than the heartbeat, which is one way to distinguish it from a vascular pulsation. If you place two fingers on your wrist to check your pulse and the fluttering under your ribs beats at a completely different tempo, a muscular twitch is more likely than a transmitted heartbeat.
Intercostal muscles, the small muscles between your ribs, can also twitch and produce a localized pulsating or fluttering sensation. These fasciculations are usually benign and related to fatigue, electrolyte imbalances, caffeine, or stress. In rare medical scenarios, intercostal twitching has been documented as a side effect of cardiac pacemaker stimulation when the device’s electrical output stimulates nearby chest wall muscles.7PubMed Central. Intercostal muscle twitching: an unusual manifestation of extracardiac stimulation related to right ventricular outflow tract pacing For most people without a pacemaker, though, an intercostal twitch is a temporary nuisance that resolves on its own within minutes to days.
Gallbladder and Digestive Triggers
The gallbladder sits tucked under the liver’s right lobe, right beneath the rib cage, and problems with bile flow can create sensations in this area that some people describe as pulsating, cramping, or a rhythmic squeezing. Biliary colic, the intermittent pain caused by gallbladder contraction against an obstruction or dysfunctional emptying, is one of the most common reasons people experience right upper quadrant discomfort. In biliary hyperkinesia, the gallbladder contracts too forcefully, and patients can experience reproducible pain roughly 40 minutes after consuming a fatty meal.8PubMed Central. Biliary Hyperkinesia: An Overlooked Cause of Right Upper Quadrant Pain
Biliary dyskinesia, the broader category where the gallbladder does not empty normally, can cause longstanding right upper quadrant pain that waxes and wanes in a way that mimics pulsation.9PubMed Central. Role of laparoscopic cholecystectomy in the management of chronic right upper quadrant pain due to biliary dyskinesia The key distinction is timing: gallbladder-related discomfort is strongly tied to meals, especially fatty ones, and tends to build over 20 to 60 minutes before resolving. A true vascular pulsation has no relationship to food intake.
Eating can also temporarily change how blood flows through the abdomen in ways that make pulsations more noticeable. After a meal, blood flow through the celiac artery and the superior mesenteric artery, the main vessels feeding the digestive organs, increases substantially. Research in healthy people has shown that blood flow to the pancreas and jejunum increases significantly within about 20 minutes of eating a mixed meal, with jejunal blood flow staying elevated for the entire digestive period.10PubMed Central. Effects of meal and incretins in the regulation of splanchnic blood flow This surge of blood into the abdominal organs can make an otherwise imperceptible aortic pulse more noticeable, especially if you sit or lie down right after eating. If your pulsating sensation reliably appears after meals and disappears between them, increased post-meal blood flow is a plausible and benign explanation.
Anxiety and Heightened Body Awareness
One of the most overlooked contributors to a pulsating sensation under the rib cage is not a change in what the body is doing, but a change in how closely you are monitoring it. Anxiety, particularly health anxiety, can make you hyper-aware of normal body sensations that you would otherwise never notice. Your abdominal aorta pulses all day, every day. Your diaphragm contracts rhythmically with every breath. Your intestines move food along with peristaltic contractions. Under normal circumstances, your brain filters all of this out. When you are anxious, the filter weakens.
Research on patients with non-cardiac chest pain found that the syndrome often persists partly because of conscious hypervigilance to body sensations that feel cardiac in nature, particularly among patients with anxiety disorders.11PubMed Central. Anxiety and hypervigilance to cardiopulmonary sensations in non-cardiac chest pain patients with and without psychiatric disorders The same mechanism applies to the right upper quadrant: once you notice the sensation and worry about it, you start checking for it repeatedly, which makes you more likely to detect it, which reinforces the worry. This feedback loop can make a perfectly normal transmitted heartbeat feel alarming and persistent. It does not mean the sensation is imaginary. It means the sensation is real but was always there, and anxiety has simply turned up the volume on your awareness of it.
If the pulsation appears only when you are lying still and paying attention to your body, disappears when you are distracted or active, matches your heart rate, and causes no pain or other symptoms, heightened interoceptive awareness driven by anxiety is the most likely explanation. Addressing the anxiety often resolves the perceived symptom entirely.
How Doctors Evaluate a Pulsating Mass or Sensation
When someone presents to a doctor with a pulsating feeling under the right rib cage, the evaluation typically starts with a physical exam. The doctor will palpate the area to determine whether there is a true pulsatile mass (something expanding with each heartbeat) or a transmitted pulsation (a normal heartbeat felt through a structure like the liver). That distinction narrows the possibilities considerably. A pulsatile mass that expands in all directions with each beat suggests an aneurysm, while a structure that simply lifts with each heartbeat suggests transmitted pulsation, potentially from a congested liver.
Ultrasound is the first-line imaging tool for evaluating right upper quadrant abnormalities. It can identify the organ involved, determine whether a mass is solid or fluid-filled, and assess blood flow using Doppler techniques. Ultrasound is considered a pivotal tool for identifying and assessing masses in this area because it can clarify organ involvement, composition, and extension into neighboring structures.12European Journal of Medical and Health Sciences. Assessment of Masses in the Right Upper Quadrant using Ultrasound Imaging If the ultrasound raises concerns, CT scans, MRI, or additional blood work may follow to pin down a diagnosis.
For most people who feel an occasional pulsation under the right ribs without pain, swelling, or other symptoms, a doctor’s visit may not even be necessary. The sensation is overwhelmingly likely to be a normal heartbeat transmitted through the liver, a benign muscle twitch, or post-meal blood flow. The situations that warrant prompt evaluation include a pulsation accompanied by pain, a visible or palpable mass that was not there before, swelling in the legs or abdomen, unexplained weight loss, or a pulsation that is dramatically different in character from what you have felt before.
Why the Right Side Gets More Attention Than the Left
People search for “pulsating feeling under the right rib cage” far more often than the same question about the left side, and there is a straightforward anatomical reason. On the left side, a pulsation near the ribs is easily attributed to the heart, which sits behind the left rib cage. The explanation feels obvious and reassuring. On the right side, most people know the heart is not directly present, so the same kind of sensation feels unexplained and therefore more worrying.
The irony is that the right upper quadrant contains the liver, which is the single best conductor of transmitted heartbeat anywhere in the abdomen. A large, solid, blood-rich organ sitting directly on top of major vessels is going to transmit pulsations more effectively than the hollow, gas-filled intestines on the left. So the right side is actually the more expected place to feel your own pulse through the abdominal wall, not the less expected one. The disconnect between anatomy and intuition is what sends people searching for answers.
There is also a practical asymmetry in pathology. The gallbladder, the hepatic flexure of the colon, the right kidney, and the duodenum all live on the right side, giving that quadrant a longer list of potential pain generators than the left upper quadrant. When a pulsating sensation coincides with any discomfort in that area, the overlapping geography of so many organs makes it harder for the person experiencing it to narrow down the cause on their own, which adds to the anxiety and the likelihood of searching online for an explanation.
Positions and Activities That Make It More Noticeable
Certain body positions compress the abdomen in ways that bring the aorta closer to the surface and make its pulsation easier to feel. Lying face-down is the classic example: your body weight presses the abdominal contents against the aorta, and the pulse becomes obvious. Lying flat on your back with your knees drawn up relaxes the abdominal wall and can have a similar effect. Sitting hunched forward at a desk compresses the upper abdomen and can bring out the sensation, which is why some people notice it only at work.
Exercise makes the pulsation temporarily stronger because cardiac output increases and the aortic pulse pressure widens. After a hard run or an intense weightlifting session, feeling a pounding sensation under the ribs for a few minutes is expected and clears as your heart rate returns to normal. Caffeine and nicotine both raise heart rate and blood pressure and can make the pulsation more prominent for an hour or two. Dehydration reduces blood volume, which can paradoxically make the aortic pulse more palpable because the vessels are less full and the pulse pressure changes.
If the pulsating sensation appears exclusively in certain positions or after specific activities and resolves when you change position or rest, that pattern strongly favors a benign cause. Pathological pulsations from aneurysms or a congested liver tend to be present regardless of position, though they may vary in intensity.