For most people, salmonella is a miserable but short-lived illness that clears up on its own within a week. But it’s not always mild. Salmonella causes roughly 1.28 million infections in the United States each year, leading to about 12,500 hospitalizations and 238 deaths, making it the leading cause of death among foodborne illnesses in the country.
Whether your case is a rough few days or something genuinely dangerous depends on your age, your immune system, and how your body responds to the infection.
What It Feels Like
Symptoms typically start 6 to 72 hours after eating contaminated food. The hallmarks are diarrhea, stomach cramps, and fever. Nausea and vomiting are common too. The diarrhea can range from loose and watery to frequent and severe, sometimes containing blood. Most people feel the worst during the first two to three days, then gradually improve.
The biggest immediate risk is dehydration. When you’re losing fluids through diarrhea and vomiting for days, your body can fall behind fast. Signs to watch for include dark urine, urinating much less than normal, a dry mouth, and dizziness when standing. These are more dangerous in young children and older adults, whose bodies have less margin for fluid loss.
How Long It Lasts
Most people recover completely within four to seven days without any medical treatment. That said, “recovery” doesn’t always mean a clean end point. Some people experience diarrhea that drags on for weeks or even months. Others feel better, then relapse with another round of symptoms before fully clearing the infection. These extended cases are less common but not rare enough to ignore.
Who Gets Hit Hardest
Salmonella is a different disease depending on who catches it. A healthy adult in their 30s will almost certainly ride it out at home. But for certain groups, the bacteria can move beyond the gut and into the bloodstream, causing what doctors call invasive disease. That’s when salmonella becomes genuinely dangerous.
The groups at highest risk for severe or invasive illness include:
- Infants and young children, whose immune systems are still developing and who dehydrate quickly
- Adults over 50, particularly those with cardiovascular disease
- People with weakened immune systems, including those with HIV, those on immunosuppressive medications, or those undergoing chemotherapy
- People with sickle cell disease
For these groups, salmonella can cause bloodstream infections, urinary tract infections, or infections in other organs. These complications require antibiotics and sometimes hospitalization.
Treatment: Mostly Waiting It Out
There’s no shortcut through a typical salmonella infection. Antibiotics are not recommended for the average case because the illness is self-limiting and antibiotics don’t speed recovery for uncomplicated infections. The main priorities are staying hydrated with water, broth, or oral rehydration solutions and resting while your immune system does the work.
Antibiotics enter the picture only for people with severe diarrhea, bloodstream infections, infections that have spread beyond the gut, or for those in the high-risk groups listed above. If your symptoms last more than a few days, include a high fever, or involve bloody stools, that’s the point where medical evaluation matters.
Long-Term Complications
Most people walk away from salmonella with nothing more than an unpleasant memory. But a small percentage develop a condition called reactive arthritis, where the immune system’s response to the infection triggers joint pain, swelling, and stiffness weeks after the gut symptoms have resolved. This typically affects the knees, ankles, or feet.
A long-term follow-up study of patients who developed reactive arthritis after salmonella found that even years later, outcomes varied widely. Of 50 patients tracked for an average of 11 years, 20 recovered completely. The rest experienced ongoing issues ranging from mild joint symptoms to chronic inflammatory spinal disease. Some had flare-ups of acute arthritis or eye inflammation years after the original infection. These outcomes represent people who already developed arthritis from salmonella, not all salmonella patients, but they show the infection can leave a lasting mark in some cases.
Where You Catch It
Salmonella isn’t just a raw-chicken problem. The CDC links most infections to chicken, fruits, pork, seeded vegetables like tomatoes, nuts, beef, and turkey. But outbreaks have also been traced to foods people rarely suspect: sprouts, nut butters, cantaloupes, cucumbers, onions, basil, raw cookie dough, and even flour. Any food can become contaminated, including processed products that seem shelf-stable.
You can also pick up salmonella from contact with animals, particularly reptiles, amphibians, and backyard poultry, or from contaminated surfaces. The bacteria need to be swallowed to cause infection, so handwashing after handling raw food or animals is the single most effective prevention step.
Putting the Risk in Perspective
Out of 1.28 million annual U.S. infections, about 1% require hospitalization and roughly 0.02% are fatal. Those are small percentages, but they translate to real numbers: 238 deaths per year. The vast majority of fatal and severe cases involve people in vulnerable groups, not healthy adults.
If you’re young, healthy, and able to stay hydrated, salmonella will likely be one of the worst stomach bugs you’ve ever had, but nothing more. If you’re in a high-risk group or your symptoms are escalating rather than improving after three or four days, that’s a different situation that warrants medical attention.