Lifestyle

5 Signs Doctors Say Could Mean Your Digestive Pain Is More Serious Than You Think

By Erica Coleman · August 17, 2026

You assumed it was something you ate. You waited it out. Three days later, the pain hasn’t moved — and it’s getting worse.

More than one-third of Americans between 50 and 59 have diverticulosis — small pouches in the colon wall that form over time. Most people never know they’re there. But when one of those pouches becomes infected or inflamed, it becomes diverticulitis — a condition that mimics a stomach bug closely enough that many people treat it with Pepto-Bismol and rest until it becomes an emergency.

The pain stays in one spot — usually the lower left. Food poisoning and stomach viruses produce pain that moves around the abdomen as your digestive system processes the irritant. Diverticulitis pain plants itself in the lower left side of the abdomen and stays there. If you can point to the exact spot that hurts — and it’s been the same spot for more than 24 hours — it’s probably not a bug.

The pain gets worse over days, not better. A stomach virus peaks within 24 to 48 hours and resolves. Diverticulitis pain often starts mild and escalates over several days, becoming progressively more severe. If you’re on day three and the pain is worse than day one, your body is not fighting off a virus — it’s fighting an infection that needs medical treatment.

You have a fever with localized abdominal pain. Food poisoning can cause a low-grade fever, but it’s typically accompanied by widespread cramping, diarrhea, and vomiting. Diverticulitis produces fever alongside localized tenderness in the lower left abdomen — often without the profuse diarrhea that marks a stomach virus. Fever plus point-specific pain is a combination that warrants a doctor’s call, not another day of waiting.

You have urinary symptoms with no UTI. The sigmoid colon sits directly adjacent to the bladder. When a diverticulum in that area becomes inflamed, it can press against the bladder and cause painful urination, urgency, and frequency — symptoms that look exactly like a urinary tract infection. If a urine test comes back negative for infection but the urinary symptoms persist alongside abdominal pain, the source may be your colon, not your bladder.

Your bowel habits changed suddenly and haven’t normalized. A stomach bug disrupts everything for a day or two, then your system returns to normal. Diverticulitis can cause constipation, diarrhea, or an alternating pattern that persists for a week or more. If your bowel habits shifted at the same time the abdominal pain started and haven’t returned to baseline, the two symptoms are likely connected.

Most uncomplicated diverticulitis is treated with antibiotics and a temporary liquid diet. But untreated cases can lead to abscesses, perforations, or fistulas — all of which may require surgery. The difference between a simple course of antibiotics and an emergency room visit is usually how long the person waited to see a doctor. If your “stomach bug” has been hurting in the same spot for more than two days and isn’t getting better, it’s time to call.