15 Most Possible Causes of Abdominal Pain

2. Gas

Gas develops when you swallow air while eating or drinking. Eating too fast, chewing gum, smoking, or drinking fizzy drinks can increase the amount of air you take in. This extra air stretches the stomach and intestines, which leads to discomfort. Gas also forms during digestion when certain foods are not fully broken down.

Some sugars, starches, and fibers reach the lower gut undigested, where bacteria feed on them and release gas as a byproduct. Gas often causes abdominal pain that feels dull, tight, or cramp-like. You may notice discomfort after meals or when your belly feels full. The pain can move around the abdomen and often improves after you pass gas or burp.

3. Irritable Bowel Syndrome (IBS)

Irritable bowel syndrome is a common cause of ongoing abdominal pain. It affects how the large intestine works rather than its structure and often involves changes in bowel habits, such as how often you have bowel movements or how they look.

The exact cause of IBS is not fully understood. The gut may overreact to normal digestion, and nerves in the digestive tract may send pain signals too easily. Stress and certain foods can also trigger or worsen symptoms.

You may feel cramping, bloating, or pressure in the lower abdomen. The pain often worsens after eating and may ease after a bowel movement. Some days you may have loose stools, while on other days you may feel constipated.

Symptoms tend to come and go, with periods of relief followed by flare-ups that can last days or weeks. Although IBS does not damage the intestines or increase the risk of serious bowel disease, the symptoms can still disrupt daily life and affect emotional well-being.

4. Acid Reflux

Acid reflux occurs when the muscle at the top of the stomach does not close properly, allowing acid and food to move in the wrong direction. Over time, repeated reflux can cause ongoing irritation and recurring pain.

Acid reflux can cause abdominal pain when stomach acid flows backward into the food pipe. This backflow irritates the lining and may trigger discomfort that starts in the upper abdomen and can move toward the chest. You often notice this after eating or when lying down.

You may feel a burning or sharp pain just below the ribs. Some people also experience pressure or a dull ache across the upper abdomen. The pain may come and go or last for hours, depending on how much acid moves upward.

Some people feel the discomfort mainly in the abdomen rather than the chest, which can make acid reflux easy to confuse with other digestive problems. The location and timing of the pain, such as after meals or when lying down, often provide useful clues.

5. Vomiting

Vomiting often appears alongside abdominal pain and usually points to a problem in the digestive system. The stomach and intestines may react to irritation, infection, or blockage by forcing their contents upward. You may feel nausea before vomiting, along with cramps or a burning sensation in the abdomen.

Common triggers include food poisoning, stomach viruses, and spoiled food, which often also cause loose stools and fever. Vomiting can also relate to irritation or damage in the stomach lining, such as ulcers. In these cases, the pain may feel dull or burning and may worsen when the stomach is empty.

Eating can bring brief relief, but vomiting may return later. Some long-term digestive conditions can lead to repeated vomiting with abdominal pain. These include problems with bowel movement patterns or food intolerance, where the body struggles to process certain foods, leading to pressure and discomfort.

6. Food Intolerances

Food intolerances can cause abdominal pain when the body has difficulty breaking down certain foods. The discomfort often begins a few hours after eating and may include cramping, bloating, gas, or loose stools. This condition differs from a food allergy.

An intolerance affects digestion rather than the immune system, so symptoms are usually uncomfortable but not immediately dangerous. Common triggers include dairy products, wheat-based foods, and drinks that contain caffeine. Some people also react to additives used to flavor or preserve food. The reaction often depends on how much of the food you eat and how sensitive your body is.

7. Constipation

Constipation is a common cause of abdominal pain. You may notice fewer than three bowel movements in a week along with hard or dry stools. This often leads to pressure, cramping, or a dull ache in the abdomen. Pain related to constipation usually builds gradually.

You may feel bloated or overly full, even after small meals. The discomfort often stays in the lower abdomen but can spread when stool backs up in the intestines. The pain often improves after a bowel movement. If stool remains trapped for too long, the discomfort can become sharper and more frequent. You may also notice gas, nausea, or a sensation that the bowel does not fully empty. Stress and changes in routine, such as travel, schedule shifts, or limited bathroom access, can disrupt normal bowel habits.

8. Pulled or Strained Muscles

Pulled or strained muscles can cause abdominal pain when the muscles in the belly wall are overstretched or torn. These muscles work during twisting, bending, coughing, and lifting, so pain often begins after a clear activity such as exercise, heavy work, or sudden movement.

You may feel sharp or sore pain in one specific spot. The discomfort often worsens when you move, laugh, sneeze, or press on the area. At rest, the pain may feel dull or may ease. This type of pain usually stays close to the surface of the body rather than deep inside the abdomen. You may also notice mild swelling, tenderness, or tightness in the affected area.

Pulled muscles can affect people of any age. Athletes, manual workers, and those who begin new physical activities too quickly often face higher risk. The pain can feel worrying, but it usually relates to muscle use rather than a problem within the internal organs.

9. Gastroesophageal Reflux Disease

Gastroesophageal reflux disease, often called GERD, occurs when stomach contents flow backward into the food pipe. This backflow irritates the lining and can cause pain in the upper abdomen or chest. You may notice a burning feeling behind the breastbone, especially after meals or when lying down.

Some people also experience a sour taste in the mouth when stomach contents rise upward. Abdominal discomfort linked to GERD often feels worse after large meals. GERD does not always cause classic heartburn. Some people mainly experience belly pain, nausea, or trouble swallowing. A dry cough or a hoarse voice can also develop when acid reaches the throat. A small opening in the chest muscle, called a hiatal hernia, can contribute.

10. Peptic Ulcers

Peptic ulcers are open sores that develop in the lining of the stomach or in the first part of the small intestine. They often cause pain in the upper abdomen, which usually feels dull or burning and may come and go. You may notice the pain when the stomach is empty or during the night. Eating can relieve discomfort for some people but worsen it for others.

Many people also feel full quickly, experience bloating, or feel nauseated. Most peptic ulcers develop due to two main causes. One is infection with H. pylori bacteria, which can spread through contaminated food or water or through close contact.

The other is frequent use of nonsteroidal anti-inflammatory drugs, which can weaken the stomach lining over time. Less common causes include severe illness, injury to the stomach lining, or rare conditions that increase stomach acid production.

11. Bladder and Urinary Tract Infections

Bladder and urinary tract infections often cause lower abdominal pain. You may feel this discomfort above the pubic bone or deep in the pelvis. The pain can range from mild pressure to a steady ache. These infections begin when bacteria enter the urinary tract.

The bacteria travel up the urethra to the bladder, where they irritate and inflame the lining, leading to swelling and pain. The discomfort often worsens as the bladder fills. You may feel brief relief after urinating, but the pain can return quickly. These infections can affect people of all ages, but they occur more often in women due to body structure. Poor hydration, holding urine for long periods, or irritation near the urethra can increase risk.

12. Crohn’s Disease

Crohn’s disease can cause ongoing abdominal pain because it leads to swelling inside the digestive tract. The pain often affects the lower right side of the abdomen but can occur anywhere from the mouth to the anus.

Crohn’s disease develops when the immune system reacts inappropriately and attacks healthy tissue in the digestive tract. Family history and certain environmental triggers can increase risk. Swelling can also narrow parts of the intestines, making it harder for food to pass and increasing discomfort.

The pain often worsens after meals or during flare-ups and may feel like cramping that comes and goes. Other common symptoms include ongoing diarrhea, unintentional weight loss, extreme tiredness, and fever during active periods.

13. Gluten Intolerance

Gluten intolerance means the body reacts poorly to gluten, a protein found in wheat, rye, and barley. After eating foods that contain gluten, you may develop abdominal pain or discomfort soon afterward. Abdominal discomfort linked to gluten intolerance does not result from damage to the intestines.

This is an important difference from celiac disease, which can injure the lining of the small intestine. Gluten intolerance also differs from a wheat allergy. A wheat allergy can trigger itching, swelling, or breathing difficulty, while gluten intolerance mainly affects digestion and overall comfort. Digestive symptoms are often the first to appear.

You may notice bloating, gas, diarrhea, or constipation. The pain usually feels dull or cramp-like and may come and go throughout the day. You may also experience symptoms beyond the digestive tract, including headaches, fatigue, joint aches, or skin rashes. This mix of digestive and non-digestive symptoms can make the cause harder to recognize.

14. Endometriosis or Menstrual Cramps

Lower abdominal pain can sometimes relate to the monthly menstrual cycle. Menstrual cramps occur when the uterus tightens to shed its lining. This pain often begins just before or during the period and may spread to the lower back or thighs.

Endometriosis can cause similar pain, but it is usually more intense and lasts longer. In this condition, tissue similar to the uterine lining grows outside the uterus and still responds to monthly hormonal changes. This tissue swells and irritates nearby organs, which can lead to deep pelvic pain. Menstrual cramps usually improve after a few days.

Endometriosis pain may start before the period, continue after it ends, or occur at other times of the month. Other symptoms may include pain during bowel movements or urination (especially during the period), heavier bleeding or spotting between periods, pain during sex, and ongoing tiredness.

15. Hepatitis

Hepatitis means the liver becomes inflamed. This swelling can cause pain or discomfort in the upper right side of the abdomen, just under the ribs. The pain often feels dull, sore, or like pressure. Hepatitis can develop from several causes, including viral infection, alcohol use, or exposure to certain toxins.

Viral types may spread through close contact, body fluids, or contaminated food or water. Some people may carry the infection without clear symptoms at first. As the liver becomes more stressed, symptoms may develop. You may feel ongoing fatigue that does not improve with rest, along with nausea, vomiting, or loss of appetite.

Some forms of hepatitis cause a short-term illness and then resolve. Other types can last for years and slowly damage the liver. With long-term infection, pain may be mild or absent early on, even as injury progresses.