Old Disease Names: A Genealogist’s Guide to Causes of Death in Old Records
Old death certificates, church burial registers, and county mortality schedules are full of terms that sound almost poetic and mean nothing to a modern reader — this guide translates the ones you're most likely to run into.
Old Disease Names: A Genealogist’s Guide to Causes of Death in Old Records
The first time I pulled my great-grandmother’s death record and read the cause of death — dropsy — I sat there not knowing whether she’d died of something contagious, something that ran in the family, or something I ought to worry about in my own line. Turns out it wasn’t really a disease at all, at least not the way we’d think of one now.
If you’ve spent any time in 1800s and early-1900s records, you’ve hit the same wall. Old death certificates, church burial registers, and county mortality schedules are full of terms that sound almost poetic — bloody flux, brain fever, King’s evil — and mean nothing to a modern reader. This guide translates the ones you’re most likely to run into, with a focus on what these old names actually tell you about an ancestor.
Why old records use names you won’t recognize
A country doctor in 1880 wrote down what he saw, not what a lab told him. No blood panels, no imaging, usually no autopsy. Cause of death was a best guess from symptoms — swelling, fever, a cough that wouldn’t quit.
So the “diagnosis” you find is really a description. Dropsy means the body was swollen with fluid — what we’d now call edema, usually from heart or kidney failure. It says nothing about the underlying disease that caused the swelling. Apoplexy just meant someone collapsed suddenly; today we’d call most of those cases a stroke.
That distinction matters for your research. A cause of death is a clue, not a conclusion. It tells you how an ancestor’s final illness looked to the people around them — and sometimes, if you read a whole page of a mortality schedule at once, it tells you an epidemic swept through the county that year.
Quick-reference glossary of old disease names
Here are the terms I reach for a translation on most often. Keep it handy when you’re reading a hard-to-place cause of death.
| Old name in the record | What it means today | Notes for researchers |
|---|---|---|
| Consumption, phthisis, decline | Tuberculosis | The single biggest killer of the 1800s |
| Dropsy | Edema (heart or kidney failure) | A symptom, not a disease |
| Apoplexy | Stroke | Any sudden collapse or paralysis |
| Ague | Malaria | Recurring fever and chills, common near marshland |
| Bloody flux | Dysentery | Often fatal in infants and the elderly |
| Brain fever | Meningitis or encephalitis | Sometimes typhoid with delirium |
| Quinsy | Peritonsillar abscess | A throat infection |
| King’s evil, scrofula | Tuberculosis of the lymph nodes | Named for the old belief a king’s touch cured it |
| St. Vitus’ dance | Sydenham chorea | A complication of rheumatic fever |
| French pox, great pox | Syphilis | Every country blamed a neighbor for it |
| Childbed fever | Puerperal sepsis | Infection after giving birth |
| Lung fever, winter fever | Pneumonia | Spikes in winter mortality lists |
| Putrid sore throat | Diphtheria | Killed children in waves |
| Summer complaint | Infant diarrhea and dehydration | Clustered in hot months |
| Milk sickness | Tremetol poisoning | From cows that ate white snakeroot |
| Jail fever, ship fever | Typhus | Spread by lice in crowded conditions |
| Camp fever | Typhoid | Contaminated water and food |
| Catarrh | Mucus, a bad cold, or bronchitis | Vague even at the time |
| Grippe | Influenza | The word is French |
| Marasmus | Severe malnutrition | Usually infants |
| Mortification | Gangrene | Tissue death, often after injury |
| Teething | Frequently a mislabeled infant death | Rarely the true cause |
The names you’ll see most often
Consumption. Nothing killed more Americans in the nineteenth century. It’s tuberculosis — a slow, wasting infection of the lungs, and the name comes from the way it seemed to consume the body from the inside. You’ll find it written as consumption, phthisis, or simply “decline.” If several people in one household died of it across a few years, you’re almost certainly looking at tuberculosis passing between them under one roof.
Dropsy. Not a disease but a sign — the body holding fluid until the legs, belly, or lungs swelled. Behind it was usually a failing heart or failing kidneys. When you see “dropsy of the chest,” think congestive heart failure; “dropsy of the brain” meant hydrocephalus, often in a child.
Apoplexy. A sudden collapse, most often a stroke. It carried no notion of a slow decline — one day the person simply dropped.
The fevers. More on those below, because they’re their own tangle.
“Fever” was a category, not a diagnosis
Read a page of an 1850 mortality schedule and half the causes of death end in the word fever. They are not the same illness, and sorting them out changes how you read a family’s story.
- Typhoid shows up as camp fever or slow fever — spread through contaminated water, common in growing towns before sewers.
- Typhus is jail fever or ship fever — a different disease entirely, carried by body lice in crowded, dirty conditions. Doctors didn’t reliably tell the two apart until the 1830s, so early records blur them.
- Malaria hid behind ague, bilious fever, or intermittent fever — the tell is the pattern of chills returning every few days.
- Scarlet fever and yellow fever were real, distinct diseases, and both moved through communities in deadly waves.
If you find a cluster of fever deaths in one place over a short span, don’t read them as unlucky individuals. Read them as an outbreak, and go looking for the local epidemic that explains it.
Diseases named for where people thought they came from
Old naming was often an accusation. Syphilis was the French pox to the English, the Spanish disease to others, and the Neapolitan disease to the French — nobody wanted to claim it. King’s evil got its name from the medieval belief that a monarch’s touch could heal scrofula. St. Vitus’ dance borrowed a saint’s name for the jerky, involuntary movements of what we now call Sydenham chorea. Knowing the backstory helps, because these poetic labels almost never match a modern medical index.
A note for Michigan researchers
Two old causes of death turn up often in Michigan’s early county records and deserve a flag.
Milk sickness hit the newly cleared frontier counties hard in the 1830s through 1850s. Settlers’ cows grazed on white snakeroot, the toxin passed into the milk, and whole families could sicken from the same churn. It’s the illness that killed Abraham Lincoln’s mother, Nancy, on the Indiana frontier in 1818 — the same wave of settlement that filled in Michigan’s interior a generation later.
Lung fever — pneumonia — drove the winter spikes you’ll notice if you read a county’s death index by month. Long, cold Michigan winters and drafty farmhouses did the rest.
When you’re working through Michigan’s death and cemetery indexes, these two are worth recognizing on sight; they can tie a death to a specific season or a specific hardship on the land.
How to use a cause of death in your research
Treat the old term as a lead, not a verdict.
- Verify it against other records. A single word on a death certificate is one person’s opinion. Church records, newspaper obituaries, and family letters often add what really happened.
- Cluster the deaths. Several people dying of the same fever, diphtheria, or influenza in a short window points to an epidemic — cholera in 1849 and 1854, diphtheria’s child-killing waves, the 1918 influenza. That context can explain a sudden gap in a family tree.
- Weigh the age. “Teething” or “summer complaint” on an infant means something very different than a cause listed for an adult. Age reframes the term.
- Don’t diagnose the living. An ancestor’s “dropsy” or “apoplexy” is not a medical warning for your own family. These were symptom labels, not genetic findings.
Frequently asked questions
What are some old-timey disease names? Common ones include consumption (tuberculosis), dropsy (edema), ague (malaria), apoplexy (stroke), bloody flux (dysentery), quinsy (a throat abscess), and King’s evil (scrofula, a form of tuberculosis).
Which disease names have changed the most? Consumption became tuberculosis, French pox became syphilis, St. Vitus’ dance became Sydenham chorea, and putrid sore throat became diphtheria. The old names described symptoms; the modern ones name the cause.
What was the most common cause of death in old records? For much of the 1800s it was consumption — tuberculosis — followed by the infectious fevers (typhoid, typhus, scarlet fever) and infant diarrhea listed as summer complaint. Together they account for a large share of the causes you’ll read in this period.