Dull pain in lower abdomen can be caused by a-lot factors, ranging from slight to severe, that suddenly comes and goes, first you need to know till when you can cure it at home or by some of your experiences but it is necessary to seek medical attention if the pain gets worse. Here's an overview to help you out the causes and when you should definitely seek medication or to consult a healthcare support:

Possible Causes:
1-Menstrual Cramps: women may experience dull pain in lower abdomen because of their menstrual cycle, specially when it's about to come or their dates are close.
2-Urinary Tract Infection (UTIs): UTIs can often cause this dull pain in lower abdomen due to some symptoms, such as burning sensation while urinating or frequent urination.
3-Gastrointestinal Issues: Digestive Issues like constipation, gas and bloating, irritable bowel syndrome and gastrointestinal can cause dull pain in lower abdomen that comes and goes, often relieved by a bowel movement.
4-Appendicities: At first you might feel a dull and centered pain around the lower abdomen after that, it sharps and shifts to the lower right abdomen.

When to see a Doctor: 
If you are feeling a dull pain it's not necessary to get scare of it, you can cure mild pain at home by some remedies but in some cases, it may also indicate a medical issue that really require your attention. so seek a healthcare provider if the pain:

• Persist and worsen overtime, it's essential to seek medication.
• Is severe and affecting your daily life.
• If you are experiencing other symptoms like fever, vomiting or vaginal bleeding, seek immediate medication.

Conclusion:
It's causes by various factor, you just need to pay attention the pattern, what you have eaten a day before and find out the cause so can take appropriate steps, understand the possible causes and seek medical help when necessary.