The 65-year-old man who walked into a Beirut hospital had one complaint. He had been hiccuping for four days. No fever. No cough. No chest pain. No blood, no night sweats, nothing.
He went home two weeks later on oral antibiotics, partway through a six-week course for a pocket of pus in his right lung.
His case was published in Clinical Medicine Insights: Case Reports by a team at the University of Balamand in Lebanon. The point they make is narrow and practical: hiccups that will not stop are not always a nuisance, and in this patient they were the only clue that anything was wrong at all.
The Number That Did Not Match the Patient
His vital signs were stable. The only abnormality on physical examination was mildly reduced air entry over the right middle and lower lung zones. He smoked a pack a day and was allergic to penicillin, but had no prior medical history.
His bloodwork was a different picture. White cells were mildly elevated at 11.52, with neutrophils at 81.3 percent. His C-reactive protein, a general marker of inflammation, came back at 297 milligrams per liter against a reference range below 10.
That is nearly 30 times the upper limit of normal in a man with no fever and no cough. The authors flag this directly, noting that older adults can mount a blunted systemic response and that the absence of fever does not rule out serious infection.
What the Chest CT Actually Showed
Doctors worked the differential from the gut upward first, because that is where persistent hiccups usually lead. Gastroesophageal reflux, esophageal cancer, gastric cancer, and pancreatic cancer were all on the list. Gastroscopy came back clean, and the CA 19-9 tumor marker was normal.
A chest X-ray showed an infiltrate in the right lower lobe. The CT scan that followed found a consolidation in the posterior segment of the right lower lobe with surrounding ground-glass changes, an internal cavity measuring about 2.8 centimeters with an air-fluid level inside it, and enlarged lymph nodes in the subcarinal region of the chest.
An air-fluid level inside a lung cavity is the radiological signature of an abscess that has opened into an airway. Tuberculosis and malignancy were both live possibilities, particularly in an elderly smoker with swollen mediastinal nodes.
Bronchoscopy with lavage settled it. There were no visible lesions in the airways. Fluid testing came back negative for tuberculosis, non-tuberculous mycobacteria, and viruses. Cytology found no malignant or atypical cells. What it did find was Klebsiella pneumoniae, sensitive to fluoroquinolones.
Why a Lung Infection Makes Someone Hiccup
Hiccups are involuntary contractions of the diaphragm and the muscles between the ribs, followed immediately by the larynx snapping shut. They run on a reflex arc with three parts: incoming signals along the phrenic, vagus, and sympathetic nerves, a processing center in the midbrain, and outgoing motor fibers to the diaphragm and the muscles between the ribs. Anything that irritates that loop can set it spinning.
Hiccups lasting beyond 48 hours are classified as persistent. Beyond two months, they are called intractable.
The anatomy explains this patient. The right lower lobe sits directly against the diaphragm, and the terminal branches of the right phrenic nerve run nearby. An inflamed, pus-filled cavity in that location can mechanically irritate or sensitize the nerve, producing repeated diaphragmatic contractions without any of the cough or fever that would normally announce a lung infection.
Similar reports exist. Persistent hiccups have surfaced as the presenting sign of aspiration pneumonia, empyema, sarcoidosis with enlarged chest lymph nodes, and lower lobe pneumonia in an elderly patient. The distinguishing feature the authors claim for their case is the complete absence of any other symptom.
Six Weeks of Antibiotics and a Marker That Tracked the Hiccups
Treatment did not run smoothly. He was started on intravenous piperacillin-tazobactam, which was stopped after a single day when he had an allergic reaction. He was switched to intravenous levofloxacin, and after 48 hours of stubbornly high inflammatory markers and a significant cavity, therapy was escalated to intravenous tigecycline.
Tigecycline continued for two weeks. His CRP fell from 297 to 171 and eventually to 26, and he improved clinically alongside it. He was discharged on oral levofloxacin to complete six weeks of antibiotics in total.
Follow-up imaging at seven days showed the pneumonia regressing, with the cavity and lymph nodes smaller but still present. A scan after treatment finished showed near-complete resolution and shrinking lymph nodes, which supported an inflammatory rather than cancerous explanation for the swollen nodes. The hiccups were gone by discharge.
The authors note the timing lined up: as CRP fell, the hiccups resolved, which strengthens the case that diaphragmatic irritation from the infection was driving them.
This is one patient, and a single case cannot say how often hiccups signal something serious. Most hiccups are brief and harmless. The takeaway the authors argue for is bounded: hiccups that persist past 48 hours without explanation warrant a look at the chest, not only the stomach. Anyone in that situation should see a clinician. The authors declared no conflicts of interest and received no funding.
Key Questions Answered
When are hiccups considered a medical problem?
Hiccups lasting more than 48 hours are classified as persistent. Those continuing beyond two months are called intractable. Both warrant medical evaluation.
What was wrong with this patient?
A 65-year-old smoker had four days of hiccups and no other symptoms. CT found a 2.8-centimeter cavity with an air-fluid level in his right lower lung, and testing identified a Klebsiella pneumoniae lung abscess.
How does a lung abscess cause hiccups?
The right lower lobe sits against the diaphragm near branches of the phrenic nerve. Inflammation there can irritate the nerve and trigger repeated diaphragm contractions.
Why did he have no fever?
His inflammatory marker was nearly 30 times normal despite a normal temperature. The authors note that older adults may show a blunted systemic response, so being afebrile does not exclude serious infection.
Does this mean hiccups are dangerous?
No. The overwhelming majority of hiccups are brief and harmless. This is a single case report describing a rare presentation.
What should someone do about hiccups that will not stop?
See a clinician. The authors argue that unexplained persistent hiccups deserve evaluation of the chest as well as the digestive tract.
