Most of the time, a bloated afternoon or a sluggish week is just that. Your gut reacts to stress, travel, new foods and short nights, and it usually settles on its own. The tricky part is knowing which symptoms are the exception.
This checklist is built for that moment of doubt. It won't diagnose anything, but it can help you decide whether to watch and wait, book an appointment or get care today.
Get care today if you notice any of these
Some symptoms shouldn't wait for a routine appointment. Call your doctor's office right away, go to urgent care or go to the emergency room if you have:
Severe abdominal pain that starts suddenly or keeps getting worse
Vomiting blood, or vomit that looks like coffee grounds
Black, tarry stools, or a large amount of blood from the rectum
Abdominal pain with fever, or a hard, swollen belly
Vomiting along with being unable to pass gas or stool
Dizziness, fainting or a racing heart along with any of the above
Book an appointment soon for these
These usually aren't emergencies, but doctors call them alarm features because they change how gut symptoms are evaluated. In its guidance on bloating, the American Gastroenterological Association advises imaging or an upper endoscopy for people with alarm features, recently worsening symptoms or an abnormal exam, rather than for everyone who bloats (Moshiree et al., 2023).
Blood in your stool. Even small amounts count. In a review of 23 primary care studies, rectal bleeding in people aged 50 or older turned out to be colorectal cancer in about 8% of cases (Astin et al., 2011). Most bleeding has a harmless cause, such as hemorrhoids, but it still needs a proper look.
Anemia or low iron. In the same review, the pooled positive predictive value of anemia for colorectal cancer was 9.7%. The authors concluded that both rectal bleeding and anemia warrant investigation, even when no other symptoms are present (Astin et al., 2011).
Weight loss you can't explain. Losing weight without trying is always worth mentioning.
Trouble swallowing, or vomiting that keeps coming back.
Symptoms that wake you from sleep.
A lasting change in bowel habits. New constipation, diarrhea or narrower stools that stick around for weeks, especially if you're 45 or older.
New bloating most days: the one women often miss
Bloating is so common that it's easy to dismiss. But the pattern matters. When researchers developed a symptom index for ovarian cancer, four symptoms stood out: pelvic or abdominal pain, urinary urgency or frequency, increased abdominal size or bloating, and difficulty eating or feeling full quickly. They were linked to ovarian cancer when they had started less than a year earlier and occurred more than 12 days a month (Goff et al., 2007).
These symptoms usually turn out to have a harmless cause, and the index isn't perfect. In its validation group, it flagged 56.7% of early-stage and 79.5% of advanced-stage cancers (Goff et al., 2007). Still, if that pattern describes you, tell your doctor using those exact words: new, most days, and for how many months.
Your history can move you up the list
Some personal and family history makes a symptom more important to check, even when the symptom itself feels mild:
A parent, sibling or child with colorectal cancer or advanced polyps
A family history of celiac disease or inflammatory bowel disease
A personal or family history of ovarian, breast or colorectal cancer, especially at a young age
Past abdominal surgery or radiation
Age still matters, but being in your 40s doesn't make you too young to take symptoms seriously. In the US, the share of colorectal cancer cases in people younger than 55 rose from 11% in 1995 to 20% in 2019, and an estimated 19,550 people under 50 were expected to be diagnosed in 2023 (Siegel et al., 2023).
Screening is separate from symptoms, so don't skip it
If you're 45 or older and at average risk, the US Preventive Services Task Force recommends colorectal cancer screening even if you feel completely fine (US Preventive Services Task Force, 2021). Screening is designed for people without symptoms.
If you have any of the alarm features above, say so. Symptoms usually call for a diagnostic workup rather than a routine screening test, and your doctor will choose the tests accordingly.
How to use this checklist
Scan the first list. If anything matches, get care today.
Check the next three sections. If something matches, book an appointment within the next few weeks rather than waiting to see if it passes.
Write down the details. Note when it started, how many days a month it happens and what makes it better or worse.
If nothing matches, it's reasonable to try practical changes and track your symptoms for a few weeks. For ongoing bloating without red flags, doctors often start with simple steps, such as a blood test to rule out celiac disease (Moshiree et al., 2023). Here's what often shifts in the gut after 40, and what tends to help.
Check again if things change. A symptom that gets worse, shows up more often or brings a new symptom along deserves a fresh look.
Sources
Moshiree B, Drossman D, Shaukat A. AGA clinical practice update on evaluation and management of belching, abdominal bloating, and distention: expert review. Gastroenterology. 2023;165(3):791-800.e3. PMID 37452811
Astin M, Griffin T, Neal RD, Rose P, Hamilton W. The diagnostic value of symptoms for colorectal cancer in primary care: a systematic review. Br J Gen Pract. 2011;61(586):e231-43. PMID 21619747
Goff BA, Mandel LS, Drescher CW, et al. Development of an ovarian cancer symptom index: possibilities for earlier detection. Cancer. 2007;109(2):221-7. PMID 17154394
Siegel RL, Wagle NS, Cercek A, Smith RA, Jemal A. Colorectal cancer statistics, 2023. CA Cancer J Clin. 2023;73(3):233-254. PMID 36856579
US Preventive Services Task Force, Davidson KW, Barry MJ, et al. Screening for colorectal cancer: US Preventive Services Task Force recommendation statement. JAMA. 2021;325(19):1965-1977. PMID 34003218
This article is for general information and isn't medical advice. If you think you may be having a medical emergency, call 911 or go to the nearest emergency room.
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