Can Hip Pain Really Cause Stomach Pain?

Hip pain and stomach pain can absolutely be connected, though the relationship runs in more directions than most people expect. Shared nerve pathways in the spinal cord, a deep abdominal muscle that doubles as a hip flexor, medications you might take for a sore hip, and hidden conditions that straddle both regions all create genuine links between what you feel in your hip and what you feel in your gut. The story is more interesting than a simple yes or no, because sometimes the hip pain is causing the stomach symptoms, sometimes the stomach problem is the real culprit behind the hip pain, and sometimes one condition is quietly producing both.

Shared Nerve Pathways and Referred Pain

The most fundamental reason hip pain and abdominal pain overlap comes down to how your spinal cord processes incoming signals. Pain-sensing nerve fibers from the skin, muscles, and joints (somatic fibers) and pain-sensing nerve fibers from internal organs (visceral fibers) don’t always stay in separate lanes. Research using recordings from individual spinal cord neurons has shown that some of these neurons receive direct input from both somatic and visceral C-fibers at the same time. In other words, a single nerve cell in your spinal cord can be getting a pain message from your hip joint and from your intestines simultaneously.¹

When that happens, your brain can misread the origin of the signal. A problem in a hip structure might be interpreted partly as abdominal discomfort, or inflammation in your gut might register as aching near your hip. This cross-talk is called referred pain, and it is not a sign that something is wrong with your nervous system. It is how human wiring works. The convergence includes both excitatory and inhibitory connections, meaning the interaction is not just a simple one-to-one relay. Inhibitory neurons can dampen signals in certain circumstances, which helps explain why referred pain patterns vary so much from person to person.¹

The Psoas Muscle Bridges Both Regions

If you wanted to design a single muscle that could create confusion between the hip and the abdomen, you would invent the psoas. This thick, rope-like muscle starts along the front of the lower spine, runs through the deep interior of your abdomen behind your intestines, then crosses the pelvis and attaches to the top of your thighbone. It is one of the most powerful hip flexors you have, and it sits right next to your kidneys, intestines, and major abdominal blood vessels. When the psoas is inflamed, infected, or in spasm, it can produce pain in both regions at once because it physically occupies both neighborhoods.

A psoas abscess is the clearest example of how this works. The muscle is innervated by nerve roots from the second through fourth lumbar vertebrae, and when an abscess forms inside it, pain can radiate to the groin, the front of the thigh, and vaguely into the abdomen. Patients often report a gradual onset of nonspecific symptoms like general malaise and low-grade fever that eventually develop into more recognizable patterns: abdominal discomfort, flank soreness, a hip held in a flexed and outward-rotated position, and pain with any movement of the hip.² The pain in the abdomen can come from direct irritation of surrounding abdominal muscles and from referred signals traveling along those L2 through L4 nerve roots.²

What makes psoas problems tricky is that they frequently do not announce themselves clearly. A person may spend weeks thinking they simply have a stiff or sore hip before anyone suspects an abscess or deeper inflammation. In one reported case, a 63-year-old man had been treated repeatedly in the emergency department for left hip pain over six weeks before a CT scan finally revealed a large psoas abscess caused by a perforated section of his colon, with infection tracking down into his leg.³ By that point he was in septic shock. That delay is the real danger with psoas-related overlap: because the symptoms initially look purely musculoskeletal, the abdominal source can go unrecognized.

When an Abdominal Condition Presents as Hip Pain

One of the most common ways people experience the hip-stomach connection is actually in the reverse direction from what the title suggests. An abdominal or pelvic condition quietly develops, but the symptom that drives you to a doctor is hip or groin pain. This happens because the organs, muscles, and nerves in the pelvis and lower abdomen share territory with structures that affect the hip.

Inflammatory bowel conditions like Crohn’s disease can erode through the intestinal wall and form abnormal connections with the psoas muscle, creating abscesses. In one case, a 27-year-old man with Crohn’s disease came to the emergency department complaining of right hip pain that had been going on for a month. Imaging revealed a fistula between his intestine and the psoas muscle, along with a psoas abscess.⁴ His chief complaint was his hip, not his abdomen, which is part of what made the diagnosis challenging.

Appendicitis can also produce a hip-area or back-area presentation, particularly when the appendix is positioned behind the cecum (the beginning of the large intestine) rather than in its more typical location. When the inflamed appendix lies in this retrocecal position, it can irritate the back of the abdominal wall near the iliac crest and produce tenderness that feels more like a back or hip problem than a textbook case of appendicitis.⁵ This is one reason emergency physicians are trained to consider abdominal emergencies when someone presents with unexplained hip pain, especially when the pain is accompanied by fever or general unwellness.

Hernias and Overlapping Pain

Hernias occupy a special place in the hip-stomach overlap because they are, by definition, structures that have slipped from one compartment of the body into another. An inguinal hernia in the groin can produce both a pulling sensation in the lower abdomen and an ache that radiates toward the hip. But the more diagnostically sneaky variety is the obturator hernia, where a loop of intestine pushes through a small opening in the pelvis called the obturator foramen, near the hip joint.

Obturator hernias are rare and disproportionately affect thin, elderly women. They typically present as recurrent hip or inner thigh pain rather than obvious abdominal symptoms, making them easy to mistake for a joint problem. In one reported case, an 86-year-old woman had recurrent right hip pain that turned out to be an obturator hernia. Because the hernial mass is concealed beneath a layer of muscle, it is almost impossible to detect on a standard physical exam.⁶ Imaging is often needed. For more common types of occult groin hernias, herniography (injecting contrast into the abdominal cavity and taking X-rays) has been used for decades and can reliably confirm or rule out a hidden hernia when the clinical picture is murky.⁷

The practical point here is that if you have vague hip or groin pain that comes and goes, worsens with straining or coughing, and sometimes has an abdominal quality to it, a hernia deserves a place on the list of possibilities even if nobody can feel a lump.

Endometriosis and the Sciatic Nerve

For people who menstruate, endometriosis is an underappreciated source of combined hip and abdominal symptoms. Endometrial-like tissue can grow on and infiltrate pelvic nerves, including the sciatic nerve, which runs from the lower spine through the buttock and down the leg. When endometriosis involves the sciatic nerve at the sciatic notch, the hallmark symptom is sciatica that follows the menstrual cycle, with progressively shorter pain-free intervals between episodes.⁸

Patients typically describe pain radiating from the posterior hip and buttock down the thigh and sometimes to the foot. In more advanced cases, muscle weakness, foot drop, and sensory loss can occur. Meanwhile, the same endometriotic process may be causing pelvic and lower abdominal pain. On MRI, the affected sciatic nerve often appears thickened, sometimes with small hemorrhagic cysts, losing its normal strand-like appearance.⁸ This condition can exist without other visible pelvic endometriosis lesions, which adds to the diagnostic difficulty.

If you notice that your hip or buttock pain reliably worsens around your period and you also have lower abdominal pain or cramping, it is worth bringing up the cyclical pattern with your doctor. The connection to the menstrual cycle is often the key piece of information that steers the workup in the right direction.

The Medication Bridge

There is one way that hip pain can cause stomach pain that has nothing to do with shared nerves or overlapping anatomy: the drugs you take to treat the hip. Nonsteroidal anti-inflammatory drugs like ibuprofen, naproxen, and diclofenac are some of the most commonly used medications for joint and muscle pain. They work by blocking enzymes involved in inflammation, but those same enzymes also produce substances that protect the lining of your stomach.⁹

When you take NSAIDs regularly for hip pain, the reduction in protective factors leaves the stomach lining more vulnerable to acid. This can lead to mucosal injury, ulcers, and bleeding. The result is a direct, causal chain: hip hurts → take anti-inflammatory → stomach hurts. It is prosaic compared to referred pain or deep abscesses, but it is probably the single most common reason people experience both hip and stomach pain at the same time. If you have been taking over-the-counter anti-inflammatories for more than a couple of weeks and start noticing stomach burning, nausea, or dark stools, the medication should be high on the suspect list. Gastroprotective strategies exist, including taking the NSAID with food or switching to formulations designed to be gentler on the stomach lining, but the simplest fix is often to talk with a doctor about whether a different type of pain management makes more sense.

Central Sensitization and Expanding Pain

When pain in any part of the body persists for a long time, the nervous system can undergo changes that amplify and spread pain signals. This process, broadly called central sensitization, can blur the boundaries between different pain regions. In the context of chronic pelvic pain, researchers have described several related mechanisms: signals from one organ amplifying signals from another nearby organ, signals from organs triggering muscle tightness in surrounding areas, tightened pelvic floor muscles in turn creating organ-like symptoms, and the expansion of the spinal cord regions that respond to pain input from the pelvis.¹⁰

What this means in practice is that someone who starts with a hip problem and tolerates it for months may gradually develop abdominal discomfort not because anything new is wrong with their gut, but because the chronic hip pain has changed how their nervous system processes signals from the entire pelvic and abdominal region. The same works in reverse: chronic irritable bowel symptoms can eventually produce musculoskeletal pain in the hip and pelvic floor. This bi-directional amplification helps explain why some people end up with overlapping pain that does not match any single diagnosis neatly. It also helps explain why treating just the hip or just the gut sometimes fails: the nervous system itself has become part of the problem.

Hip Pain in Children Needs a Wider Lens

In children, hip pain requires a broader differential than in adults because kids may not articulate their symptoms clearly, and several pediatric conditions blur the hip-abdomen line. Pediatric hip pain can stem from orthopedic causes, infections, inflammatory conditions, tumors, and even nonmusculoskeletal sources.¹¹ A child complaining of hip pain who also seems to have stomach symptoms could be dealing with anything from a viral illness causing joint inflammation and GI upset simultaneously, to an appendicitis that is referring pain to the hip, to a psoas infection secondary to a spinal or abdominal problem.

Clinicians evaluating pediatric hip pain are advised to organize possibilities by how long symptoms have been present, whether the pain seems to come from inside the joint or outside it, and the child’s age, since different conditions cluster at different ages.¹¹ If your child has hip pain along with fever, abdominal pain, weight loss, or refusal to walk, these combined symptoms should prompt urgent evaluation rather than a wait-and-see approach.

Practical Red Flags and When to Seek Help

Most hip pain is musculoskeletal and most stomach pain is digestive, and the two just happen to show up around the same time by coincidence. But several patterns suggest the two symptoms share a common cause and warrant medical attention sooner rather than later:

• Fever with both: When hip pain and abdominal pain occur alongside fever, an infection like a psoas abscess or appendicitis should be ruled out. As the case reports described earlier in this article illustrate, these can present subtly for weeks before becoming emergencies.
• Cyclical worsening: If both pains track your menstrual cycle, endometriosis involving pelvic nerves is a possibility worth investigating with imaging.
• NSAID use: If you have been taking anti-inflammatory medications for your hip for more than a couple of weeks and your stomach symptoms are new, the medication connection is the simplest explanation to evaluate first.
• Weight loss or night sweats: Combined with hip and abdominal pain, these suggest something beyond a musculoskeletal issue, including infection, inflammatory disease, or in rare cases, malignancy.
• A hip that is stuck flexed: Inability or reluctance to extend the hip, especially combined with abdominal symptoms, is a classic sign of psoas involvement and calls for imaging.

Telling your doctor about both symptoms together, rather than mentioning them as separate complaints at separate visits, is the single most useful thing you can do. The connection between the hip and the abdomen is well established in medical literature, but a clinician can only investigate it if they know both symptoms are present. Many of the missed diagnoses in case reports involve patients who mentioned only one symptom or were seen by different providers for each.