Five hours after delivering her baby by cesarean section, a 42-year-old woman noticed her face was swelling on both sides, worse on the right, spreading down toward the angle of her jaw. She was not feverish. Her white blood cell count was normal. Nothing hurt.
She had seen this before. After a previous cesarean, also under spinal anesthesia, the same swelling had appeared and cleared on its own in three days. Her doctors at Baxshin Hospital in Sulaymaniyah, Iraq, arrived at a diagnosis with an unhelpfully misleading name: anesthesia mumps.
The case was published August 31 in the journal Clinical Medicine Insights: Case Reports, and what the authors call novel is not the swelling itself. It is that the swelling came back.
A Complication Named After a Virus It Has Nothing to Do With
Anesthesia mumps, known formally as acute postoperative sialadenitis, is sudden swelling of the salivary glands after anesthesia. It usually affects the parotid glands, the ones that sit in front of and below the ears, which is exactly where the mumps virus causes swelling. The resemblance is entirely superficial. No virus is involved.
The authors report a prevalence between 0.16 and 0.2 percent, and note that most documented cases follow lengthy operations under general anesthesia. Their patient had a 45 minute cesarean under spinal anesthesia, awake the entire time. She had also been vaccinated against mumps in childhood.
Doctors have described the condition since the 1960s, when Schwarz and colleagues called it surgical mumps. Reilly and colleagues renamed it a decade later after reporting three cases among roughly 1,500 patients who received general anesthesia. Despite six decades of case reports, the authors write that the incidence, the underlying mechanism and any standard prevention protocol all remain undefined. A 2023 case following a cesarean delivery and a 2022 report of bilateral swelling are among only a handful published after spinal anesthesia.
What Actually Causes the Swelling
Several explanations compete, and none has been proven. Under general anesthesia with mask or mechanical ventilation, positive pressure can force air backward into the parotid gland through Stensen's duct, the drainage channel that opens inside the cheek. Muscle relaxants loosen the tissue around that opening and make the process easier.
None of that applied here. This patient was breathing on her own. That leaves the other proposed mechanisms: obstruction of the salivary ducts, dehydration from preoperative fasting thickening the saliva, pressure on the glands from lying flat, and drugs that reduce saliva flow.
She received atropine during surgery for a slow pulse, and atropine is a well-recognized cause of dry mouth. She also had a body mass index of 32, which the authors describe as a possible minor contributor through extra soft tissue around the gland. They are careful to call these theoretical. A single patient cannot establish that any of them caused the recurrence.
The patient also had gestational diabetes and antiphospholipid syndrome. The authors raise, then immediately dismiss, the idea that either condition affected blood flow to the gland or the consistency of her saliva. They write that no strong epidemiological or clinical evidence connects those diagnoses to salivary stasis. Earlier reports have linked the condition to severe obesity, where soft tissue in a short, thick neck can compress the regional vasculature and salivary ducts during positioning. Her class I obesity is a much weaker version of that scenario.
Ruling Out the Things That Would Have Been Serious
The clinical work here was mostly a process of exclusion, and it matters because the alternatives are far worse than a swollen gland.
Infectious parotitis was unlikely: no fever, no redness, no pus, no tenderness, normal inflammatory markers. Serum amylase was normal, which, along with a normal white cell count, supported a non-infectious cause. A salivary stone was improbable given the sudden bilateral onset and an open Stensen's duct opening. Allergic reaction and angioedema were ruled out by the complete absence of itching, hives, lip or tongue swelling, or breathing trouble.
The team gave intravenous saline, paracetamol, a single dose of antibiotics as a precaution and one dose of pethidine for pain, before an ear, nose and throat specialist confirmed the swelling was not infectious. It improved daily and cleared completely by the fourth day after surgery.
The authors do note that in rare cases, particularly under general anesthesia in patients with obesity or during long procedures, the swelling can become severe enough to cause massive facial edema and block the airway, requiring emergency intubation. Another published case required re-intubation after surgery. That did not remotely happen here.
Why a Reassuring Diagnosis Is Worth Making Quickly
The patient's first reaction was anxiety. She had just given birth, and her face was swelling for no obvious reason. According to the report, the specialist's reassurance that the condition was harmless and self-limiting was what relieved her.
That is the practical point of the paper. The authors write that "anesthesia-induced mumps is a reversible and transient complication," and argue that recognizing it prevents unnecessary scans, biopsies, and invasive procedures. They acknowledge the limits of a single case: no causal link can be drawn between the recurrence and any of the suspected contributors, and the findings cannot be generalized to other obstetric patients.
The report also has a gap. No ultrasound or CT was performed, which the authors list as a limitation, because imaging was not available on the ward and they wanted to reassure the patient without delay. Anyone who develops facial swelling after surgery should have it evaluated rather than assume it is benign.
Key Questions Answered
What is anesthesia mumps? It is sudden, usually painless swelling of the salivary glands, most often the parotid glands, appearing during or shortly after anesthesia. The medical name is acute postoperative sialadenitis. It has no connection to the mumps virus.
How common is it? The case report cites a prevalence of 0.16 to 0.2 percent, based mostly on patients under general anesthesia. Cases after spinal anesthesia for cesarean delivery are rare, with only a handful described in the medical literature.
Why is this particular case notable? The same patient developed identical bilateral swelling after two separate cesarean deliveries under spinal anesthesia. The authors report that recurrence in the same patient was not documented among the obstetric cases they reviewed.
Is it dangerous? Usually not. Most cases resolve within hours to a few days without specific treatment. Rare severe cases involving major facial swelling and airway obstruction have been reported, mainly under general anesthesia and during long procedures.
How was it treated? Conservatively. The patient received intravenous fluids, pain relief and a precautionary dose of antibiotics before infection was ruled out by a specialist. The swelling resolved completely by the fourth day after surgery.
Does this mean people should worry about spinal anesthesia? No. This is a single case report describing a rare and self-limiting complication. It cannot establish cause, and it does not indicate a broader risk. Anyone with concerns should raise them with an anesthesiologist before surgery.
