What causes lower abdominal pain on the left or right side?

Lower abdominal pain is a common complaint that can range from mild discomfort to severe, sharp pain. Understanding potential causes—especially whether the pain is on the left or right side—can help you decide when to seek medical advice. Below, we’ll review common and uncommon causes of lower abdominal pain, key warning signs, and when to talk to a doctor.

General Considerations

• Pain intensity: dull ache vs. sharp, cramping vs. constant
• Onset: sudden vs. gradual
• Associated symptoms: fever, nausea, vomiting, diarrhea, urinary changes, vaginal bleeding or discharge
• Risk factors: age, sex, medical history, recent infections or injuries

Right-Sided Lower Abdominal Pain

1. Appendicitis

   • Typically begins as a dull pain near the belly button that shifts to the lower right abdomen
   • Often worsens with movement, coughing, or pressing on the area
   • May be accompanied by fever, nausea, vomiting, and loss of appetite
   • Appendicitis is a medical emergency—see a doctor immediately if you suspect it

2. Kidney Stones

   • Sharp, cramping pain radiating from the lower back to the lower right abdomen and groin
   • May cause blood in urine, painful urination, nausea, and vomiting
   • Pain often comes in waves as the stone moves through the urinary tract

3. Ovarian Conditions (in people assigned female at birth)
   a. Ovarian cysts

   • Fluid-filled sacs on the ovary that may cause dull or sharp one-sided pain
   • Can be accompanied by bloating or pressure
     b. Ovarian torsion
   • Twisting of the ovary cutting off its blood supply
   • Sudden, severe pain, often with nausea and vomiting—requires immediate medical care

4. Hernia

   • Occurs when tissue pushes through a weakness in the abdominal muscle wall
   • Bulge in the groin or lower abdomen, pain that worsens with lifting or straining

5. Gastrointestinal Causes

   • Crohn’s disease: inflammation that can affect any part of the digestive tract, often causing crampy pain
   • Constipation: hard stools stretching the colon, causing a generalized lower abdominal ache

Left-Sided Lower Abdominal Pain

1. Diverticulitis

   • Inflammation or infection of small pouches (diverticula) in the colon, most common in people over 40
   • Persistent pain in the lower left abdomen, fever, constipation or diarrhea, nausea

2. Kidney Stones

   • Similar presentation to right-sided stones but felt on the left side
   • Sharp, wave-like pain radiating to the groin, blood in urine, urinary urgency

3. Ovarian Conditions
   a. Ovarian cysts or torsion (see above)
   b. Endometriosis

   • Tissue similar to uterine lining growing outside the uterus
   • May cause cyclical lower abdominal pain, heavy or painful periods, pain during intercourse

4. Hernia

   • Similar to right side but occurring on the left, with a visible bulge and discomfort when straining

5. Gastrointestinal Causes

   • Irritable bowel syndrome (IBS): crampy abdominal pain often relieved by bowel movements, with diarrhea or constipation
   • Ulcerative colitis: inflammation of the colon lining, causing bloody diarrhea and left-sided cramping

Bilateral or Central Lower Abdominal Pain

• Urinary Tract Infection (UTI)

• Burning with urination, frequent urges, lower abdominal pressure or cramping
  • Pelvic Inflammatory Disease (PID)
• Infection of the female reproductive organs, causing lower abdominal pain, fever, unusual discharge
  • Gastroenteritis (“stomach flu”)
• Viral or bacterial infection causing generalized cramping, diarrhea, vomiting, fever
  • Muscular strain
• Overuse or injury to abdominal muscles, worsens with movement or stretching

When to Seek Immediate Medical Attention

Lower abdominal pain can sometimes signal a life-threatening condition. Call emergency services or go to the nearest emergency department if you experience:

• Sudden, severe pain that wakes you from sleep or worsens quickly
• Pain accompanied by fever over 101°F (38.3°C)
• Inability to pass stool, gas, or keep down fluids
• Vaginal bleeding beyond your normal period or sudden heavy bleeding
• Signs of shock: rapid heartbeat, low blood pressure, dizziness, fainting
• Chest pain, shortness of breath, or pain radiating to the shoulder

Managing Mild to Moderate Lower Abdominal Pain

• Track your symptoms: location, intensity, triggers, associated signs
• Over-the-counter pain relief: acetaminophen or NSAIDs (ibuprofen), as directed
• Heat therapy: warm compress or heating pad on the painful area
• Dietary adjustments: increase fiber and fluids for constipation or IBS; avoid gas-forming foods
• Rest and gentle movement: light walking can ease gas and improve circulation

If your pain lingers beyond a few days, worsens despite self-care, or has unclear triggers, consider a free, online symptom check, using the doctor approved Ubie Symptom Checker.

Next Steps and Prevention

• Regular check-ups: discuss chronic digestive or urinary symptoms with your primary care doctor
• Healthy diet: plenty of fiber, fruits, vegetables, and hydration to prevent constipation and diverticular disease
• Safe lifting techniques and core strengthening to reduce hernia or muscle strain risk
• Timely treatment of infections: UTIs, PID, gastroenteritis

Final Thoughts

Lower abdominal pain has a wide range of causes—from benign to urgent. Pay attention to your body’s signals, track patterns, and don’t hesitate to seek medical care when in doubt. If you experience any severe or worrisome symptoms, speak to a doctor right away to rule out life-threatening conditions.

Remember, while online tools like the Ubie Symptom Checker can help point you in the right direction, they’re not a substitute for professional medical advice. If your lower abdominal pain is severe, persistent, or accompanied by alarming signs, see a healthcare provider as soon as possible.