Crohn’s Disease Symptoms & Signs: What You Need to Know
Danielle Gaffen, MS, RDN, CSDH, LD
- Last Updated
Crohn’s disease symptoms can resemble those of other digestive conditions and can vary widely from person to person. Symptoms may become more noticeable during a flare and lessen or disappear during remission. Changes in bowel movements, ongoing abdominal pain or cramping, fatigue, or unexplained weight loss can be important signs to discuss with a healthcare professional, but symptoms alone cannot confirm Crohn’s disease.
Co-written by Renata Cauchon-Robles, MS, RDN
Crohn’s disease is a chronic inflammatory bowel disease (IBD) that can cause inflammation anywhere in the digestive tract, although it most often affects the small intestine and the beginning of the large intestine. It can affect digestion, nutrient absorption, energy levels, and day-to-day life.
Because other conditions can cause similar digestive symptoms, it is important to speak with a doctor or gastroenterologist about ongoing or concerning changes. This article explains common Crohn’s disease symptoms and signs, how they may change over time, and when to seek medical care. It is intended for general education and cannot diagnose Crohn’s disease or rule out other causes of digestive symptoms.
Signs and Symptoms of Crohn’s Disease
Crohn’s disease can affect each person differently, and symptoms may vary depending on the location and severity of inflammation. Some symptoms can interfere with day-to-day life, but even symptoms that seem mild or come and go are worth discussing with a healthcare professional.
Common Digestive Symptoms
Common symptoms of Crohn’s disease include:
Other digestive symptoms may include:
- Frequent loose or watery bowel movements
- A sudden or urgent need to have a bowel movement
- Blood in the stool or rectal bleeding
- Reduced appetite
- Nausea or vomiting
Other Possible Symptoms and Signs
Crohn’s disease can also cause symptoms outside the digestive tract, including:
- Fatigue or tiredness
- Fever
- Anemia or iron deficiency
- Mouth sores
- Joint pain or soreness
- Eye redness, pain, or vision changes
- Skin changes, such as red, tender bumps, rashes, or sores
Some people with Crohn’s disease may also develop pain, swelling, sores, bleeding, or drainage around the anus. These symptoms can sometimes be related to a fissure, fistula, or abscess and should be discussed promptly with a healthcare professional.
Having one or more of these symptoms does not necessarily mean that someone has Crohn’s disease, as other digestive conditions can cause similar concerns. Living with chronic or unpredictable symptoms can also affect daily life and emotional well-being.
Next, we’ll look at how Crohn’s disease symptoms can change during flares and remission, as well as when it’s important to speak with a healthcare professional.
Does Crohn’s Disease Always Have Symptoms?
Not always. Crohn’s disease can have periods when symptoms are active or worsen, called flares, and periods when symptoms improve or may not be noticeable, called remission. The timing and severity of symptoms can vary from person to person.
During a flare, symptoms such as diarrhea, abdominal pain or cramping, bowel urgency, blood in the stool, fatigue, or nausea may become more noticeable. However, worsening symptoms do not always mean that Crohn’s-related inflammation is active. A healthcare team may use blood or stool tests and, when appropriate, endoscopy or imaging to help determine whether symptoms are related to active inflammation or another cause.
During remission, many people feel better or have few noticeable symptoms. Even so, continued follow-up and monitoring remain important. Some foods may worsen symptoms for certain people, particularly during a flare, but food does not cause Crohn’s disease, and a food reaction alone does not necessarily mean that inflammation is active.
Next, we’ll look at what Crohn’s disease may look and feel like—and why symptoms alone cannot confirm a diagnosis.
What Does Crohn’s Disease Look Like?
Crohn’s disease does not have one specific outward appearance. A person cannot be diagnosed with Crohn’s disease based on how they look alone.
Crohn’s disease can cause inflammation anywhere along the digestive tract, from the mouth to the anus. It most often affects the small intestine and the beginning of the large intestine. Where inflammation occurs can influence the symptoms a person experiences.
A doctor or gastroenterologist uses a medical history, physical exam, and appropriate testing to diagnose Crohn’s disease. Learn more in our guide to how Crohn’s disease is diagnosed.
What Does Crohn’s Disease Feel Like?
Crohn’s disease can feel different from person to person. Some people describe cramping, aching, or persistent abdominal pain. Others experience diarrhea, fatigue, nausea, or reduced appetite, or an urgent need to have a bowel movement or blood in the stool.
Symptoms may be mild and intermittent for some people, while for others they can have a greater effect on work, sleep, meals, and daily activities. Bowel urgency, stool frequency, and abdominal pain can have a meaningful effect on day-to-day life.
Where inflammation occurs in the digestive tract can also influence the symptoms a person experiences.
If you are concerned about ongoing digestive symptoms, the next section explains what to track and how to prepare for a medical appointment.
Undiagnosed Crohn’s Disease Symptoms
Crohn’s disease symptoms can overlap with those of other digestive conditions, so symptoms alone cannot confirm a diagnosis. A doctor or gastroenterologist may review your symptoms, medical and family history, and physical exam findings, then order blood or stool tests, endoscopy with biopsies, and imaging tests when appropriate. You can also learn more in our guide to how Crohn’s disease is diagnosed.
If you are concerned about possible Crohn’s disease, make an appointment with a healthcare professional. Keeping a short symptom journal before your visit can help you describe what has changed, but it should not delay medical care.
What to Track Before Your Appointment
Consider making notes about:
- How often you have bowel movements and whether you experience urgency
- Stool consistency, using a tool such as the Bristol Stool Chart
- Any blood in the stool
- The location and severity of abdominal pain or cramping, using a 0–10 scale if helpful
- Symptoms such as fatigue, fever, nausea, vomiting, reduced appetite, or unintended weight loss
- Symptoms outside the digestive tract, such as mouth sores, joint pain, eye symptoms, or skin changes
- Changes in medications, stress, sleep, or foods that seem to affect symptoms
These notes can provide helpful context for your care team, but they cannot determine whether inflammation is active or whether you have Crohn’s disease.
When to Seek Medical Care
Make an appointment with a doctor or gastroenterologist for ongoing diarrhea, abdominal pain, blood in the stool, unintended weight loss, fatigue, fever, or changes in bowel habits that do not improve. Seek urgent medical care for heavy bleeding, severe abdominal pain, ongoing vomiting, a high fever, or signs of dehydration.
A registered dietitian can provide valuable nutrition support during an evaluation or after diagnosis, including help with hydration, food intake, weight changes, nutrient concerns, and avoiding unnecessary food restriction. However, a doctor or gastroenterologist confirms a Crohn’s disease diagnosis and evaluates disease activity. An IBD-focused dietitian can work alongside the rest of the healthcare team to support your nutritional needs.
Crohn’s Disease Symptoms in Females
Crohn’s disease can cause the same digestive and whole-body symptoms discussed above in females. However, menstrual cycles can sometimes make digestive symptoms harder to interpret. Some women and people who menstruate notice more abdominal pain or cramping, diarrhea, bloating, fatigue, or bowel urgency in the days before or during their period.
Menstrual cramps and Crohn’s-related abdominal pain can overlap, which may make changes in symptoms harder to interpret. Tracking symptoms alongside your menstrual cycle can help you and your healthcare team notice patterns over time. Changes around your period do not automatically mean you are having a Crohn’s flare.
Talk with a gastroenterologist or gynecologist if symptoms are new, severe, different from your usual pattern, or accompanied by irregular or missed periods.
If you are thinking about pregnancy or are already pregnant, speak with your gastroenterology and obstetric care teams early. Fertility and pregnancy planning are individualized, and many women with IBD have healthy pregnancies. When possible, pregnancy is best planned during remission. For more information, see our guide to Crohn’s disease and pregnancy.
Take Home Message
Crohn’s disease can look and feel different from person to person, and symptoms may come and go over time. If you have ongoing digestive symptoms—such as diarrhea, abdominal pain, blood in the stool, fatigue, fever, unintended weight loss, or changes in bowel habits—speak with a doctor or gastroenterologist.
Symptoms alone cannot diagnose Crohn’s disease. A diagnosis requires a medical evaluation and appropriate testing. Once Crohn’s disease is diagnosed, an IBD-focused registered dietitian can help support hydration, adequate nutrition, symptom management, and a flexible eating pattern as part of your care team.
Learn More
- Learn about how Crohn’s disease can show up in children
- Try these 5 self-care strategies for Crohn’s disease
- Learn the difference between Crohn’s and Celiac disease
References
- National Institute of Diabetes and Digestive and Kidney Diseases. Definition & facts for Crohn’s disease. Accessed November 10, 2026. https://www.niddk.nih.gov/health-information/digestive-diseases/crohns-disease/definition-facts
- National Institute of Diabetes and Digestive and Kidney Diseases. Symptoms & causes of Crohn’s disease. Accessed November 10, 2026. https://www.niddk.nih.gov/health-information/digestive-diseases/crohns-disease/symptoms-causes
- Crohn’s & Colitis Foundation. Crohn’s disease symptoms: what to watch for. Accessed November 10, 2026. https://www.crohnscolitisfoundation.org/patientsandcaregivers/what-is-crohns-disease/symptoms
- Crohn’s & Colitis Foundation. Fistulizing Crohn’s disease. Accessed November 10, 2026. https://www.crohnscolitisfoundation.org/patientsandcaregivers/what-is-crohns-disease/treatment/surgery/fistulizing-crohns-disease
- Crohn’s & Colitis Foundation. Mental health and IBD. Accessed November 10, 2026. https://www.crohnscolitisfoundation.org/patientsandcaregivers/mental-health
- Crohn’s & Colitis Foundation. Managing flares. Accessed November 10, 2026. https://www.crohnscolitisfoundation.org/patientsandcaregivers/what-is-ibd/managing-flares
- National Institute of Diabetes and Digestive and Kidney Diseases. Diagnosis of Crohn’s disease. Accessed November 10, 2026. https://www.niddk.nih.gov/health-information/digestive-diseases/crohns-disease/diagnosis
- Hunter Gibble T, Macey J, Makin H, et al. Exit interviews exploring patients’ experience of change in Crohn’s disease symptoms during the mirikizumab phase 3 clinical trial in adult patients with moderately-to-severely Crohn’s disease. Crohns Colitis 360. 2025;7(1). doi:10.1093/crocol/otae079
- Cleveland Clinic. Bristol stool chart. Accessed November 10, 2026. https://my.clevelandclinic.org/health/articles/bristol-stool-chart
- Crohn’s & Colitis Foundation. Resources for IBD flares. Accessed November 10, 2026. https://www.crohnscolitisfoundation.org/patientsandcaregivers/flare-resources
- Crohn’s & Colitis Foundation. Finding an IBD-focused dietitian. Accessed November 10, 2026. https://www.crohnscolitisfoundation.org/patientandcaregivers/diet-and-nutrition/finding-ibd-focused-dietitian
- Crohn’s & Colitis Foundation. Puberty and menstruation. Accessed November 10, 2026. https://www.crohnscolitisfoundation.org/effects-of-ibd-on-women/puberty-and-menstruation
- Saha S, Midtling E, Roberson E, Nair VA, Wald A, Reichelderfer M. Dysmenorrhea in women with Crohn’s disease: a case-control study. Inflamm Bowel Dis. 2013;19(7):1463-1469. doi:10.1097/MIB.0b013e318281f3a9
- Armuzzi A, Bortoli A, Castiglione F, et al; Italian Group for the Study of Inflammatory Bowel Disease Working Group. Female reproductive health and inflammatory bowel disease: a practice-based review. Dig Liver Dis. 2022;54(1):19-29. doi:10.1016/j.dld.2021.05.020
- Crohn’s & Colitis Foundation. Pregnancy and IBD. Accessed November 10, 2026. https://www.crohnscolitisfoundation.org/effects-of-ibd-on-women/pregnancy-and-ibd
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